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GOAL

A 3-Wire DHT 11 of unknown pedigree is to be connected to a Raspberry Pi:

enter image description here

SDA GPIO

The goal is to take "due diligence" and avoid frying an rPi. Thank you

RESOURCES

Ada Fruit's 4-pin DHT11 indicates 3-5 Power.

The "kookeye" tutorial shows 3.3V power & 3 direct wires between DHT11 and rPi.

enter image description here

QUESTIONS

  1. If powered by 5V, will the DHT11 communicate at proper (3.3V?) voltage level?
  2. If powered by 3.3V will the DHT11 communicate at the proper 3.3V voltage level?
  • 2
    Why take the risk? Why not just power it from 3V3? – joan Feb 11 at 22:35
  • I DEFINITELY wouldn't! These modules have a pullup from Vcc to the data pin. – Milliways Feb 11 at 22:51
  • My answer to the following DHT11 question might help: raspberrypi.stackexchange.com/questions/97949/…. – tlfong01 Feb 12 at 2:19
  • Yet another of my couple of answers on DHT11, this time explaining the "latch up" thing which might have fired your Pi: raspberrypi.stackexchange.com/questions/96560/…. Good luck. Cheeers.. – tlfong01 Feb 12 at 2:23
  • 1
    @tlfong01: Good postings! I have not wired the sensor: my rPi should be in good shape. I added a new questions based on tlfong01's comments. I am now wondering if powered by 3.3.V the DHT11 will safely communicate at 3.3V with the data line? – gatorback Feb 12 at 3:34
1

Answer

DHT11 Wiring Suggestion

dht11 wiring


References

(1) Rpi connected to MCP3008 connected to DHT11 seemed fried problem - Asked 2019apr15 Viewed 115 times

(2) DHT11 sensor and the wrong voltage may have fried my RPi3 - Asked 2019apr26 Viewed 145 times


Appendices


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