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jbruce 2018-12-03 07:41:04 -05:00
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troubleshooting.md
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@ -1,31 +1,31 @@
I sucked at handling my Rpi gpio pins.
I got everything backward you could.
I blew up a MAX-31855 chip. POOF, UP IN SMOKE!
Don't be like me...
Troubleshooting
==========
If you're using a breadboard with a labeled break-out board, verify
where pin one is using a multimeter. it sounds stupid, but it will save you time.
measure the voltage between all the 3V3 pins and a GND pin
measure the voltage betwwen all the GND pins and a GND pin
measure the voltage between the 5V pins and a GND pin.
if everything measures as expected, continue. if not, go back to the first step.
When I started this project, I'd never worked with RPi gpio. I think I got
just about everything backwards possible. I blew up a MAX-31855 chip... POOF,
up in smoke!
run
gpio readall
and make sure the mode for all GPIO pins you want to test have a Mode of IN
if not, set the mode for each..
So, invest a little time to learn the hardware and the software available to
you to veriy everything works as expected.
# set BCM pin 4 as an input
gpio -g mode 4 input
## Breadboard Orientation
# verify it got set correctly using
gpio readall
![Image](https://github.com/jbruce12000/kiln-controller/blob/master/public/assets/images/breadboard.png)
# enable pull-down resistor for pin 4 to make sure V stays
# zero when nothing is connected to the input
gpio -g mode 4 down
If you're using a breadboard with a labeled break-out board, verify:
* where pin one is using a multimeter. it sounds stupid, but it will save you time.
* measure the voltage between all the 3V3 pins and a GND pin
* measure the voltage betwwen all the GND pins and a GND pin
* measure the voltage between the 5V pins and a GND pin.
## Test Each GPIO Pin
At thought I one point that I had fried my RPi. I needed to verify that it
still worked as expected. Here's what I did to verify GPIO on my pi.
'''gpio readall'''
'''
+-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
@ -52,6 +52,23 @@ gpio -g mode 4 down
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+
'''
make sure the mode for all GPIO pins you want to test have a Mode of IN
if not, set the mode for each..
# set BCM pin 4 as an input
gpio -g mode 4 input
# verify it got set correctly using
gpio readall
# enable pull-down resistor for pin 4 to make sure V stays
# zero when nothing is connected to the input
gpio -g mode 4 down
watch gpio readall