Hi there, im new on this forum and want say hello to everyone, at begin want to apologise for my english, i cant write technical language, but i will try to describe my issue best i can, and i have hope, that somebody help to solve it.
My first project is a humidity/temp control board, based on arduino uno clone, it's a board with ch340 and on centre of board are two push buttons marked as KEY L and KEY H, but lets we back to problem, my set working perfect just with dht22 and three temporary led's conected to pins four, seven and eight which are responsible for controling fan, mist maker, and heater. Problem begin when i connect relay switch, a sensor start go crazy, when i set desired humidity at 10 percent, a relay is ON which is wrong, normal humidity is around fifty percent, so it should be off, and swithing OFF when i change on ninety percent, and temp sensor also giving wrong readings.
Any ideas, what is a reason of that behaviors? Thanks for reading
Ps. can't use six, seven, eight and nine on my laptop :)