13-02-2018, 22:15
(This post was last modified: 13-02-2018, 22:17 by Barrow4491.
Edit Reason: Spelling
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(12-02-2018, 19:05)Werk_AG Wrote: Hi Jim,
If a particular LCD module works with one unit at a given address, it should work with any other unit using the the same I2C address.
Having or not the TX module installed doesn't affect the functionality of the LCD display.
Werk,
I understand the address issues but I could not get the system to boot.
I finally solved the issue, it was the HTU21D, I have no idea why but by disconnecting it the unit boots as it should and I replaced it with a spare and now all is working well.
On the issue of 20 x4 LCD’s I recently received a couple of serial units without the I2C module, and realising my mistake, I ordered the modules and attached them but they will not work with my AQ unit.
I noticed that the only difference is that the two capacitors C1 andC2 are missing from the two ex serial modules.
Do you know what the values of these SMD caps are? C2 appears to be a tantalum as it has a polarity marking, because I am sure that if fitted they would be usable again
Regards
Jim