i have old rpi model b. not rpi2 model b, original model b. have created brand new installation of raspbian lite, installed python rplcd library on it, , wrote simple little test script display "hello world!" on lcd. works great. no problems. wonderful.
bought rpi3 model b. new. shiny. pretty. take micro sd card out of adapter that's in original rpi, , put in new rpi3. transfer, pin pin, wiring new rpi3. start system, run script, , nothing on display. double, triple, quadruple check wiring. still nothing.
same script, on same sd card, works on original model b, doesn't on 3 model b.
know they're compatible on first 26 pins, don't know why wouldn't work. appreciated.
[edit: not compatible on first 26 pins. pin 3 changes gpio 2, pin 5 changes gpio 3 , pin 13 changes gpio 27.]
bought rpi3 model b. new. shiny. pretty. take micro sd card out of adapter that's in original rpi, , put in new rpi3. transfer, pin pin, wiring new rpi3. start system, run script, , nothing on display. double, triple, quadruple check wiring. still nothing.
same script, on same sd card, works on original model b, doesn't on 3 model b.
know they're compatible on first 26 pins, don't know why wouldn't work. appreciated.
[edit: not compatible on first 26 pins. pin 3 changes gpio 2, pin 5 changes gpio 3 , pin 13 changes gpio 27.]
depending on how old model pi 1b there 2 differences in gpio.
older models used
* gpio21, later models same physical pin gpio27 (see http://pinout.xyz/pinout/pin13_gpio27)
* i2c0. changed i2c1 on later models.
potential problem library try determine model pi make adjustments , doesn't recognise pi3b.
if still have problems please post link library installed.
older models used
* gpio21, later models same physical pin gpio27 (see http://pinout.xyz/pinout/pin13_gpio27)
* i2c0. changed i2c1 on later models.
potential problem library try determine model pi make adjustments , doesn't recognise pi3b.
if still have problems please post link library installed.
raspberrypi
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