Reef-Pi pH-ORP adapter

[Roberto_b]

@Roberto_b I hooked up the pH board on one of my development Pi, following is the sequence of command I am using (I have configured the pH board to use 0x44 address using the onboard address switches). Here is the run down of minimum set of things I have to do, the example is in handy i2cset, i2cget command, I'll port the equivalent in golang for reef-pi. Can you check if I am doing the right things:

• Reset the board

i2cset -y 1 0x44 0x06

• Configuret the board for continuous reading

i2cset -y 1 0x44 0x40 0x06

• Start the conversion process

i2cset -y 1 0x44 0x08

• Ask for next reading

i2cset -y 1 0x44 0x10

• Get the next value

i2cget -y 1 0x44

Anyone in the thread who have used it sees any issue?

Seem ok, does it work ? in case try i2cdetect to be sure the board address / connections are ok.

 

[Roberto_b]

Thank you for sharing files. Can used this shield for Arduino. Is there a code reference for Arduino. Thank you

by sure you can use it with arduino, check the C code example to use it , is very easy, i'm not confidence with arduino , but i'm sure is not difficult write same few lines code for Arduino.

 

[Roberto_b]

Seem ok, does it work ? in case try i2cdetect to be sure the board address / connections are ok.

Ranjiib , i was thinking about during coffe break, base address could be from $40 to $43, 44 is not possible.....correct it and check.

 

[Roberto_b]

No reason to use a package istead a different size, has been a choise..
Two inputs for what ? for double probe ? ..... no particular reason
0X40 is fixed addr base for AD , can't be changed, but can be changed on PCa9685.
each pH probe with BNC connector can be used.
Probe tipically came with cable / BNC with 1mt cable, do not exceed to much with I2C cable, but i think 3mt can be ok, better if you use a shielded cable and connect one side of shield (Pi3 side) to gnd.

I forget a consideration, one of main reason i don't get in consideration to use two probes on single ADC is to obtain galvanic insulation on each pobes, not possibile if you use same ADC. Really not necesary in all tank, but often solve many leackage problems.

 

[BlakeFL]

I'm looking to build this board and before I source all the parts I thought I would ask if anyone has a pcb and any spare ic's available that I could purchase. Please let me know and I can pay for parts and shipping in US.

 

[Roberto_b]

I'm looking to build this board and before I source all the parts I thought I would ask if anyone has a pcb and any spare ic's available that I could purchase. Please let me know and I can pay for parts and shipping in US.

i will chek tomorrow if i hava some pcb's in advance.

 

[Roberto_b]

i will chek tomorrow if i hava some pcb's in advance.

Sorry but unfortunately i have used all pcb to assemble the samples, i don't have them in advance, but i'm looking for manufacture to assemble small quantity for all guys like it, mount this board is not easy.

 

[speedstar]

Here is a parts list in a cart for those in US. You may have to swap the lmp7721MA out to the the one that isn't reel cut as it maybe on backorder.

https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5d45ad1a36

 

[Ranjib]

I got the board recognized and reading analog voltage values via i2ctools, working on reef-pi code. This will involve converting the raw readings to human readable pH values as well as calibration.

 

[sector9]

This is great. I built my board today. I am getting -13k to -14k readings in my tank. My tank is about pH 7.5 by my pH meter

 

[Ranjib]

This is great. I built my board today. I am getting -13k to -14k readings in my tank. My tank is about pH 7.5 by my pH meter

Can I ask ,What soldering tools you use?

 

[sector9]

Can I ask ,What soldering tools you use?

I have a temperature controlled Radioshack soldering iron that I used with a thin pencil tip, solder, some tweezers, flux, and desoldering braid for a few mistakes. Cleaned the flux off with isopropyl alcohol and a toothbrush. Checked all connections with a 10x loupe. All of which I already had on hand. I think that's about it? This was my first time doing a large number of surface mount components so I watched a couple of Youtube videos. Cost was very reasonable, about $25 or less for components from Arrow. I did order the wrong size capacitors so they were TINY lol

 

[sector9]

I made a crude calibration using my pH standard solutions and it seems to work pretty well! I am measuring a cup containing my saltwater. This only involved a quick change to the sample program from the Github. I really have no idea where to start with regards to plugging this info in to Reefpi tho lol

 

[Trickman2]

Very cool

 

[Jonathan Troutt]

I am going to be ordering 10 of these boards tonight. I will assemble them myself. I wont need all ten so if anyone wants one I would be willing to sell one fully assembled for a reasonable amount. For instance cover cost of parts and shipping.

 

[Jonathan Troutt]

Hey guys. I am getting ready to place order with mouser. I wanted to hope on here and make sure that everything is coming along with reef-pi and supporting these boards. @Ranjib are they working as expected, no updates or revisions to the board to components?

 

[Ranjib]

I have only tested them manually , the reef-pi software integration part is still work in progress.

 

[Jonathan Troutt]

I have only tested them manually , the reef-pi software integration part is still work in progress.

That’s fair I just wanted to make sure it was going to happen before I started building them

 

[Trickman2]

I am going to be ordering 10 of these boards tonight. I will assemble them myself. I wont need all ten so if anyone wants one I would be willing to sell one fully assembled for a reasonable amount. For instance cover cost of parts and shipping.

Pm the price please

 

[Ranjib]

the ph board driver is almost there: https://github.com/reef-pi/drivers/pull/10