Power Saving
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Before Width: | Height: | Size: 192 KiB After Width: | Height: | Size: 392 KiB |
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@ -7,9 +7,8 @@
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https://git.cryhost.de/crycode/attiny85-radiohead-dht22-weather-sensor/-/tree/master
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*/
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// pin with the LED connected
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#define LED_PIN 4
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// pin with the transistor base (And LED) is connected
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#define TRANSISTOR_BASE_PIN 4
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// blink time for the LED
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#define LED_TIME 200
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@ -33,10 +32,12 @@
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*/
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#define WATCHDOG_WAKEUP 9
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// Sleep this many again before waging up. Sleep time in s = WATCHDOG_WAKEUP s * WATCHDOG_SLEEP_FURTHER, e.g. 8*8s = 64s
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#define WATCHDOG_SLEEP_FURTHER 8
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// pins for the radio hardware
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#define RH_RX_PIN 6 // not used, set to a non-existent pin
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#define RH_TX_PIN 3
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#define RH_RX_PIN 6 // not used, set to a non-existent pin
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#define RH_TX_PIN 3 // Transmit Pin
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#define RH_PTT_PIN 6 // not used, set to a non-existent pin
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#include <Arduino.h>
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@ -53,14 +54,13 @@
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#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
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#endif
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// DHT22 lib
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// not using the current adafruit dht library, because it's too memory intensive
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#include "dht22.h"
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dht22 dht;
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#define RH_BUF_LEN 5
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uint8_t rh_buf[RH_BUF_LEN] = { 0x00, 0x00, 0x00, 0x00, 0x00 };
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uint8_t rh_buf[RH_BUF_LEN] = {0x00, 0x00, 0x00, 0x00, 0x00};
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// reduce the RadioHead max message length to save memory
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#define RH_ASK_MAX_MESSAGE_LEN RH_BUF_LEN
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@ -68,7 +68,6 @@ uint8_t rh_buf[RH_BUF_LEN] = { 0x00, 0x00, 0x00, 0x00, 0x00 };
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// RadioHead
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#include <RH_ASK.h>
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// Message Headers:
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#define MSG_START 0x00
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#define MSG_TEMP 0x01
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@ -77,7 +76,6 @@ uint8_t rh_buf[RH_BUF_LEN] = { 0x00, 0x00, 0x00, 0x00, 0x00 };
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#define MSG_SOIL 0x04
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#define MSG_ERR 0xee
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RH_ASK rh_driver(RH_SPEED, RH_RX_PIN, RH_TX_PIN, RH_PTT_PIN);
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// watchdog flag
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@ -86,7 +84,6 @@ volatile boolean f_wdt = 1;
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// temp / humid toggle
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volatile uint8_t counter = 0;
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// prototypes:
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void gotoSleep(void);
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@ -98,94 +95,120 @@ void setup_watchdog(int ii);
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void system_sleep();
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void setup() {
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void blink(uint8_t num);
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void setup()
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{
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// setup the LED pin
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pinMode(LED_PIN, OUTPUT);
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pinMode(TRANSISTOR_BASE_PIN, OUTPUT);
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pinMode(SOIL_PIN, INPUT);
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// init the DHT22
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dht_init(&dht, DHT_PIN);
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uint8_t num_blink = 3;
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if (!rh_driver.init()) {
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if (!rh_driver.init())
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{
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num_blink = 5;
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}
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// blink 3 times
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for (uint8_t i = 0; i < num_blink; i++) {
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digitalWrite(LED_PIN, HIGH);
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_delay_ms(LED_TIME);
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digitalWrite(LED_PIN, LOW);
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_delay_ms(LED_TIME);
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}
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blink(num_blink);
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// send start message
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rh_buf[0] = MSG_START;
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rh_send(1);
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setup_watchdog(WATCHDOG_WAKEUP);
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}
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// main loop
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void loop() {
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void loop()
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{
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if (f_wdt) {
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if (f_wdt)
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{
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f_wdt = 0;
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// turn on the LED
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digitalWrite(LED_PIN, HIGH);
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// turn on the LED and the transistor:
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digitalWrite(TRANSISTOR_BASE_PIN, HIGH);
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// temperature and humidity
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float t = 0;//float is 32bit = 4 byte
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float t = 0; //float is 32bit = 4 byte
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float h = 0;
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int soil = 0;
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long battery = 0;
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if (counter % 4 == 0) {
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rh_buf[0] = MSG_BAT;
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battery = getVcc();
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memcpy(&rh_buf[1], &battery, 4);
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rh_send(RH_BUF_LEN);
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}else if (dht_read_data(&dht, &t, &h) == 1) {
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if (counter % 3 == 0) {
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// wait for everything the transistor switched on:
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delay(25);
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if (counter % 4 == 0)
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{
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rh_buf[0] = MSG_BAT;
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battery = getVcc();
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memcpy(&rh_buf[1], &battery, 4);
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rh_send(RH_BUF_LEN);
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}
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else if (dht_read_data(&dht, &t, &h) == 1)
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{
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if (counter % 3 == 0)
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{
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rh_buf[0] = MSG_TEMP;
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memcpy(&rh_buf[1], &t, 4);
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} else if (counter % 3 == 1) {
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}
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else if (counter % 3 == 1)
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{
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rh_buf[0] = MSG_HUMID;
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memcpy(&rh_buf[1], &h, 4);
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} else if (counter % 3 == 2) {
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}
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else if (counter % 3 == 2)
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{
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rh_buf[0] = MSG_SOIL;
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soil = analogRead(SOIL_PIN);
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memcpy(&rh_buf[1], &soil, 2);
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}
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rh_send(RH_BUF_LEN);
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} else {
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rh_send(RH_BUF_LEN);
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}
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else
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{
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// error message
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blink(4);
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digitalWrite(TRANSISTOR_BASE_PIN, HIGH);
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delay(5);
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rh_buf[0] = MSG_ERR;
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rh_send(1);
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}
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counter++;
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// turn off the LED
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digitalWrite(LED_PIN, LOW);
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system_sleep();
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// turn off the LED and transistor:
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digitalWrite(TRANSISTOR_BASE_PIN, LOW);
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// deep sleep
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for (uint8_t i = 0; i < WATCHDOG_SLEEP_FURTHER; i++)
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{
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system_sleep();
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}
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}
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}
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void blink(uint8_t num)
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{
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// blink n times
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for (uint8_t i = 0; i < num; i++)
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{
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digitalWrite(TRANSISTOR_BASE_PIN, HIGH);
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_delay_ms(LED_TIME);
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digitalWrite(TRANSISTOR_BASE_PIN, LOW);
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_delay_ms(LED_TIME);
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}
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}
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// function to send RadioHead messages from the buffer
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void rh_send(uint8_t len) {
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void rh_send(uint8_t len)
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{
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rh_driver.send((uint8_t *)rh_buf, len);
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rh_driver.waitPacketSent();
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}
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ISR(WDT_vect)
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{
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f_wdt = 1; // set global flag
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@ -194,28 +217,29 @@ ISR(WDT_vect)
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/* set system into the sleep state
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system wakes up when watchdog is timed out
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*/
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void system_sleep() {
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//cbi(ADCSRA, ADEN); // switch Analog to Digitalconverter OFF
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void system_sleep()
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{
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set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here
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sleep_enable();
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sleep_mode(); // System sleeps here
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sleep_mode(); // System sleeps here
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sleep_disable(); // System continues execution here when watchdog timed out
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//sbi(ADCSRA, ADEN); // switch Analog to Digitalconverter ON
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sleep_disable(); // System continues execution here when watchdog timed out
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}
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/* 0=16ms, 1=32ms,2=64ms,3=128ms,4=250ms,5=500ms
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6=1 sec,7=2 sec, 8=4 sec, 9= 8sec
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*/
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void setup_watchdog(int ii) {
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void setup_watchdog(int ii)
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{
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byte bb;
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int ww;
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if (ii > 9 ) ii = 9;
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if (ii > 9)
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ii = 9;
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bb = ii & 7;
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if (ii > 7) bb |= (1 << 5);
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if (ii > 7)
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bb |= (1 << 5);
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bb |= (1 << WDCE);
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ww = bb;
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@ -227,31 +251,33 @@ void setup_watchdog(int ii) {
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WDTCR |= _BV(WDIE);
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}
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/**
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From https://github.com/cano64/ArduinoSystemStatus/blob/master/SystemStatus.cpp
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*/
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int getVcc() {
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//reads internal 1V1 reference against VCC
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#if defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny44__)
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ADMUX = _BV(MUX5) | _BV(MUX0); // For ATtiny84
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#elif defined(__AVR_ATtiny85__) || defined(__AVR_ATtiny45__)
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ADMUX = _BV(MUX3) | _BV(MUX2); // For ATtiny85/45
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#elif defined(__AVR_ATmega1284P__)
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ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); // For ATmega1284
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#else
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ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); // For ATmega328
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#endif
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delay(2); // Wait for Vref to settle
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int getVcc()
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{
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//reads internal 1V1 reference against VCC
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#if defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny44__)
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ADMUX = _BV(MUX5) | _BV(MUX0); // For ATtiny84
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#elif defined(__AVR_ATtiny85__) || defined(__AVR_ATtiny45__)
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ADMUX = _BV(MUX3) | _BV(MUX2); // For ATtiny85/45
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#elif defined(__AVR_ATmega1284P__)
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ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); // For ATmega1284
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#else
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ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); // For ATmega328
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#endif
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delay(2); // Wait for Vref to settle
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ADCSRA |= _BV(ADSC); // Convert
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while (bit_is_set(ADCSRA, ADSC));
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while (bit_is_set(ADCSRA, ADSC))
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;
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uint8_t low = ADCL;
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unsigned int val = (ADCH << 8) | low;
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//discard previous result
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ADCSRA |= _BV(ADSC); // Convert
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while (bit_is_set(ADCSRA, ADSC));
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while (bit_is_set(ADCSRA, ADSC))
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;
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low = ADCL;
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val = (ADCH << 8) | low;
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return ((long)1024 * 1100) / val;
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return ((long)1024 * 1100) / val;
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}
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