#PHP SLEEP FOR 500 MILISECONDS HOW TO#
#PHP SLEEP FOR 500 MILISECONDS SERIAL#
#PHP SLEEP FOR 500 MILISECONDS CODE#

Note: although the RTC has granularity 1 second, by reading TCNT2 the second can be subdivided into intervals of 1/256 second.

My power measurements agree with Nick Gammon's, around 1.5mA average consumption at 3V operation.

#PHP SLEEP FOR 500 MILISECONDS SERIAL#

Upon reset, it uses the 32 kHz crystal to calibrate the internal 8 MHz RC oscillator, for more accurate serial Baud rates. Runs in POWER_SAVE sleep mode, waking every second to print the time.

#PHP SLEEP FOR 500 MILISECONDS CODE#

Here is example code to make an ATmega328 RTC using a 32 kHz crystal on the OSC pins.

#PHP SLEEP FOR 500 MILISECONDS HOW TO#

Need to know elapsed time so the milliamps * time calculation is accurate.ĭoes anyone have suggestions on how to approach this problem? I'm wondering if the solution is the not-so-good SLEEP_MODE_PWR_SAVE where Timer 2 still works and I clock that externally? My Google-foo isn't working so well on finding solutions / descriptions for this. The ADC integrates/averages over this time.ADC conversion elapsed time is only accurate to 10%.maximizing power savings (slower) (UI will sleep after timeout, not on 100% of time) 500ms was chosen for tradeoff between updating the user interface rate (faster) vs. Will wake up every ~500ms to read ADC.seems to be close to no savings if SLEEP_MODE_IDLE if I understand Mr.micro won't sleep at all if interrupted with 1.024kHz INT0 wake-ups due to 1ms wakeup time.Want to use SLEEP_MODE_PWR_DOWN for minimum power usage.The INA226 will trigger an interrupt on INT1 when an ADC conversion is complete, the micro will wake up, check how much time has elapsed, get the reading, and calculate milliamp-seconds, then go back to sleep. The reason I need millisecond accuracy is that the ADC readings from the INA226 will be about 500ms apart (but the timing is maybe 10% accurate). And just today I learned that the wakeup time from sleep is about 1 ms 5V, 16MHz) so that means I won't sleep at all. My plan was to use the square wave clock output of the RTC at 1.024kHz to INT0, waking from sleep, and counting the (approximately) millisecond pulses. Some forum posts suggested using an RTC, so I looked into that. But then I learned that millis() doesn't work in SLEEP_MODE_PWR_DOWN. As this is a columb counter, I wanted to keep accurate (to the millisecond) time to calculate the amp-hours (from milliamp-seconds measurements), and wanted no worse than 1% accuracy. Since this is battery powered, I wanted to use LowPower.h and SLEEP_MODE_PWR_DOWN to get the current drain really low. I'm looking to make an accurate columb counter based off an INA226 on a custom PCB with a stripped down ATmega328P (no USB, no high quiescent power supply, no LEDs, etc). Most easy SW stuff I understand, but interrupts and deep sleep required a lot of reading up. I'm a hardware EE (previously, but now just a manager), but don't understand much software.

I've done days and days of reading (I'm quite new to Arduino).

Php sleep for 500 miliseconds