My Reef-Pi build thread

dmolavi · Feb 10, 2019

Thanks. A few more parts on order and if I can figure out how to wire up a master power button without screwing the pooch I'll be good to go.

I miss radio shack....

dmolavi · Feb 12, 2019

Got my connectors today. Now just need to find a panel mount BNC for the pH probe...

Ranjib · Feb 13, 2019

Looking good

geekengineer · Feb 13, 2019

Where did you get the reef-pi pico board?

dmolavi · Feb 13, 2019

geekengineer said:
Where did you get the reef-pi pico board?

http://blueacro.com/controllers/picobeta

geekengineer · Feb 13, 2019

oh. its a secret beta thing.. Thanks.

dmolavi · Feb 13, 2019

Haha, not really a secret. A PM to @theatrus (the builder of the board), and he would have sent it to you.

dmolavi · Feb 20, 2019

@theatrus When using the 1-wire interface for the temp probes, they should show up automatically in the temperature section, correct? How can I troubleshoot why they aren't? Do I need to do anything else to enable them (add as a jack or input or something)?

Edit - i'm only seeing about 1.4 V across VCC on my connector. I'll upload a connection pic in a minute...

dmolavi · Feb 20, 2019

Both sensors are connected to the VCC, gnd and data from the 1 wire input. Ignore the jumpers.

Basically, data for both sensors are on on row 26, ground is 27, vcc is 28.

dmolavi · Feb 20, 2019

duplicate

dmolavi · Feb 20, 2019

Nevermind....3.3 V is there. Tight confines for the multimeter leads...

Wait, that's when no probes are connected. With 1 connected, I see 1.4ish.

Frack, series vs parallel. Grr...

theatrus · Feb 20, 2019

Could you confirm your TRS wiring? It feels like you're throwing the 3V3 regulator into overload, maybe by reverse bias.

dmolavi · Feb 20, 2019

Red VCC
Yellow data
Black gnd

Based on this from the build guide I think it's right:

Assuming the tip of the male audio jack is upward, the longest terminal of the jack represents GND, left terminal represents +Ve and the right terminal represents data.

Did you see my followup re: series v parallel?

I attached a photo of the physical wiring of the 2 sensors to the protoboard as well, above.

theatrus · Feb 20, 2019

dmolavi said:
Red VCC
Yellow data
Black gnd

Based on this from the build guide I think it's right:

Assuming the tip of the male audio jack is upward, the longest terminal of the jack represents GND, left terminal represents +Ve and the right terminal represents data.

Did you see my followup re: series v parallel?

I attached a photo of the physical wiring of the 2 sensors to the protoboard as well, above.

Missed the follow-up. The pinout looks correct though.

dmolavi · Feb 20, 2019

theatrus said:
Missed the follow-up. The pinout looks correct though.

I need to rewire on the protoboard, don't I? Power from the TRS to the power rail, jumper to 2 separate 'rows', one for each sensor, right? Can the data lines all be on the same 'row'?

dmolavi · Feb 22, 2019

theatrus said:
Missed the follow-up. The pinout looks correct though.

@theatrus I rewired so that they aren't in series. I now see 3.3v when probing each VCC/gnd.

But the sensors still aren't showing up in ReefPi. I've double checked the wiring on the sensor side. Still no joy...

Should both sensors be connected to the same data line going to the TRS connector? I have both data lines and the TRS data line in the same 'row' on the protoboard.

theatrus · Feb 22, 2019

dmolavi said:
@theatrus I rewired so that they aren't in series. I now see 3.3v when probing each VCC/gnd.

But the sensors still aren't showing up in ReefPi. I've double checked the wiring on the sensor side. Still no joy...

Should both sensors be connected to the same data line going to the TRS connector? I have both data lines and the TRS data line in the same 'row' on the protoboard.

Yes, they share the same data line. Does using one sensor alone work? Can you confirm that you have enabled 1-wire in the /boot/config.txt file (using the pico board example has the 1wire support turned on)?

dmolavi · Feb 22, 2019

theatrus said:
Yes, they share the same data line. Does using one sensor alone work? Can you confirm that you have enabled 1-wire in the /boot/config.txt file (using the pico board example has the 1wire support turned on)?

No joy on 1 or 2 sensors. I do see this in dmesg:

[ 3.691605] w1-gpio onewire@0: gpio pin 4, external pullup pin -1, parasitic power 0
[ 3.691649] w1_add_master_device: set_pullup requires write_byte or touch_bit, disabling

Something or nothing?

Doing ls /sys/bus/w1/devices/ only lists
w1_bus_master1

dmolavi · Feb 22, 2019

Dunno if this helps:

Code:

pi@reefpi:~ $ gpio readall
 +-----+-----+---------+------+---+---Pi 3+--+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 | ALT0 | 1 |  3 || 4  |   |      | 5v      |     |     |
 |   3 |   9 |   SCL.1 | ALT0 | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 0 | IN   | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | IN   | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | ALT5 | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 0 | IN   | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 0 | IN   | CE1     | 11  | 7   |
 |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
 |   5 |  21 | GPIO.21 |   IN | 0 | 29 || 30 |   |      | 0v      |     |     |
 |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
 |  13 |  23 | GPIO.23 | ALT0 | 0 | 33 || 34 |   |      | 0v      |     |     |
 |  19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO.27 | 27  | 16  |
 |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
 |     |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+---Pi 3+--+---+------+---------+-----+-----+

Those pin names don't seem to match what's in the Pico board schematic. Don't know if that matters...

dmolavi · Feb 22, 2019

Did an rpi-update and now my dmesg shows:
[ 2.715384] Driver for 1-wire Dallas network protocol.
[ 2.722306] gpio-4 (onewire@0): enforced open drain please flag it properly in DT/ACPI DSDT/board file

Still nothing in /sys/bus/w1/devices/