First of all, let me begin by saying that I'm still pretty much a rookie.
I have a project with a dht21, an LDR and an ultrasonic distance sensor. I have 3 different arduino uno boards, namely:
- A (supposedly) original arduino uno r3.
- A chinese nhduino, arduino uno r3 clone.
- And this one, sitting on top of this.
I've been playing around with the three boards for the last couple of months, testing a variety of sensors and having the same results with the three boards, as expected. But then, with the aforementioned setup, I'm getting very different readings on the DHT21 sensor. If I use the "regular" (first two) arduinos plugged in my laptop, the readings are consistent. But if I use the banana pi(duino), I get the temperature reading correct, but getting weird humidity readings... pretty most of the time a 5% humidity value.
Everything tested on the same room, same sensors and same protoboard. No external power supply.
I'm totally clueless here, any ideas of what could be the problem?