ht12e encoder for RF transmission

Thread Starter

denison

Joined Oct 13, 2018
328
Hi all, I am trying to use the encoder(transmitter) with my nano board for rf transmission. The problem seems to be what the encoder regards as high and low. A low input voltage has a max voltage of 0.2v and a high a min of 0.8.
Should be no problem with the digital high. I believe the digital low of the nano must be greater than 0.2v as a I get an invalid transmission for a low.
The receiver module ht12d(decoder) gives an invalid transmission message from the encoder. Manually connecting to ground gives valid transmission.
Can anybody suggest a solution to drag the low to below 0.2v?
 

kaindub

Joined Oct 28, 2019
125
Look at the datasheet again. A low is 0.2 of Vdd and a high is 0.8V of Vdd. So if you are using 5V rails, low is 1V and high is 4V.
 

sghioto

Joined Dec 31, 2017
5,378
I would think the outputs of the nano should have no problem pulling the input pins low on the ht12e. The low voltage output on the nano would depend on the load. The inputs of the ht12e have internal pullup resistors.
Did you add pullup resistors and have you measured the output pins of the nano?
 
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