sparkfun/sparkfun_rht03_arduino_library

A simple library for RHT03 temperature and humidity sensor, which communicates over a 1-wire digital interface.

sparkfun_rht03_arduino_library's Issues

Using delay() with noInterrupts()

In function RHT03::update(), the delay() function is used on lines 55 and 59 after noInterrupts() is set.

I have only tested this code on an Arduino MKR WAN 1300 and the delay() function does not work if interrupts are disabled. If it is replaced with delayMicroseconds(), it seems to work. The delay() function gives a constant delay of 800 us, no matter what value is passed to it, if interrupts are disabled. The function micros() is working with disabled interrupts on this board which is essential for decoding correctly.

Since the sensor, according to the specification, requires a low signal >1 ms to start the measurement, a low signal for just 800 us sometimes causes errors. I have seen many comments in different forums that a lot of checksum errors should be expected from this sensor. I don't think it's the sensor, it is this coding mistake in this routine.

I have not tested other boards, they may behave differently.