thistle99
Newbie level 1
Hi,
I am building a simple 3 bit wireless transmitter/receiver using 433 MHz modules and a HT12E/D for the data encoding.
I've built the transmitter part of my project on veroboard, but the HT12E doesn't seem to be outputting a data signal on pin 17. I connected an LED between pin 17 and GND and nothing happens.
I have +5v on pin pin 18 and pins 1-14 (including TE) are all connected to GND (checked with a multimeter). There is 680K resistance between pins 16 and 17 (the oscillator resistor).
I have a test circuit built up on breadboard. If I take the HT12E off the veroboard and put it on the breadboard, it works fine.
Any idea what I might have got wrong?
The schematic is here:
And a photo of the built up circuit is here:
I am building a simple 3 bit wireless transmitter/receiver using 433 MHz modules and a HT12E/D for the data encoding.
I've built the transmitter part of my project on veroboard, but the HT12E doesn't seem to be outputting a data signal on pin 17. I connected an LED between pin 17 and GND and nothing happens.
I have +5v on pin pin 18 and pins 1-14 (including TE) are all connected to GND (checked with a multimeter). There is 680K resistance between pins 16 and 17 (the oscillator resistor).
I have a test circuit built up on breadboard. If I take the HT12E off the veroboard and put it on the breadboard, it works fine.
Any idea what I might have got wrong?
The schematic is here:
And a photo of the built up circuit is here: