AHT20
Pieter.Verhoeven 2025-05-04 16:46:04 446 Views1 Replies I am using raspberry pi4 and a grove hat to connect with AHT20 temp/RH sensor.
I try to use your DFRobot_AHT20.py and demo_read_aht20.py software but by running it I get the message “AHT20 is busy!”
I can read the 3, 4, 5 bytes so the temperature can be read.
The 1,2 bytes read 152,66 and do not change so the humidity cannot be read.
What can I change in the software?
In the DFRobot_AHT20.py, ensure that after sending the trigger measurement command, you add a short delay (typically 75ms or more as per datasheet) before trying to read the results:
Find the section like this in DFRobot_AHT20.py:
self.i2cbus.write_i2c_block_data(self._address, 0xAC, [0x33, 0x00])
Make sure it's followed by a delay:
time.sleep(0.08) # wait 80 ms for measurement
If there's no delay or a shorter one, increase it to 0.08 or even 0.1.
ahsrab.rifat 