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LCD backpack pinout definition
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LCD backpack pinout definition

by raldi on Fri Aug 07, 2020 2:08 pm

I bought the Adafruit USB + Serial LCD Backpack Add-On with Cable <https://www.adafruit.com/product/781> and was surprised to find no documentation of the pinout.

One side obviously matches the pins on the LCD, and the tutorial confirms that those just get hooked up directly, but the other side has pins reading as follows. Can some help fill in the blanks?

* 5V: I'm assuming this is where power is to be supplied. What range of voltages can it handle?
* 3V: Is this supposed to be a second supply of power? Or is this a convenience, where the board is allowing us to *get* 3V power if we need it?
* Gnd: I think I figured this one out :)
* TX / RX: Serial I/O
* PB0: ???
* PC2: ???
* PC4: ???
* PC7: ???

TLDR: What are we supposed to do with the last four pins? And is 3V supposed to be power input or output?

raldi
 
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Re: LCD backpack pinout definition

by dastels on Fri Aug 07, 2020 5:39 pm

They are digital output pins not used by he display, but which can be manipulated via commands. See the last bit of the command reference: https://learn.adafruit.com/usb-plus-serial-backpack/command-reference. The Rx/Tx are the serial interface, as an alternative to the 3-pin JST connector.

Dave

dastels
 
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Please be positive and constructive with your questions and comments.