[AllanG]

Now I'm really puzzled!

I bought another DHT22 which arrived today and I installed it right away. I was quite excited as I powered up the RX board and really expected to see it work properly. I was disappointed though - the results are still the same as before.

Checked again and all is well on the RX board with 5v at the DHT22 where it should be, ground connection ok and data pin connected to the Nano. 10K Resistor R4 is in place and gives correct reading when I check between pins 1 & 2 on the PCB with sensor disconnected.

So I made up a test lead and checked the DHT22 which does appear to be working (actually the first one is too ) as I get the following on serial monitor:

# DHT22 Sensor Demo
24.30:71.40
24.10:74.20
24.10:74.50
24.10:75.10
23.70:67.90
23.70:69.20
23.70:71.60
23.80:71.00
23.60:68.10
23.50:65.80
23.30:63.00
23.20:59.40
23.00:57.40
22.90:56.90
22.80:56.00
22.70:55.50

I just can't see any hardware issues that can be causing the problem. Is there anything in software I need to check, please??

Allan.