Des Westcott
Well-Known Member
Thanks. That's basically what I was doing.
reef-pi :: An opensource reef tank controller based on Raspberry Pi.
- Thread starter Ranjib
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- controller raspberry-pi
- Tagged users Ranjib
Thanks. That's basically what I was doing.
OP
OP
Support for else (as in if - else ) and combining multiple sensor values are two things I’m thinking as something we need as part of next evolution of macro.
Ranjib I managed to upload db file from 6 months ago, now it works. Well all I did when all data was gone is that I added 6 led drivers and lights. After reboot nothing left in pi. Now all works again exept adafruit gets only 7 data feeeds in minute, I will play with that later.
sellereef
New Member
Anyone have any thoughts with this one? I may end up with other "Standard black boxes" but I just want to be prepared
Carlo Rios
New Member
You can make your own or whit ML Goby hat and PWM converter for Mars Aqua from ML Reefkeeping. He sell them here : https://www.tindie.com/products/ranthalion/pwm-converter-for-mars-aqua/
Carlo Rios
New Member
I have to get one for my Viparspectra.
I used the ML reef-pi adapters for my viparspectra lights, and they have similar adapters for the mars lights. Along with the ml reef-pi hat, it was almost plug-and-play: https://www.tindie.com/products/ranthalion/pwm-converter-for-mars-aqua/
Very small annoyance with a current behaviour: When i manually dose extra to correct some value, i use the calibration menu of the dosing pumps. There isn't another option, is there? Anyway, when i do that, the amount i manually dosed doesn't show up in the usage statistics in the dashboard. Which makes sense if it's for calibration, doesn't make sense for manual dosing to keep track of how much of a chemical is actually going into the tank.
Adding analog sensors with ADS1115
Michael Lane has been working on a new ADS1015/ADS1115 driver for reef-pi.
This brings new possibilities to Reef-Pi:
ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier
ADS1115 Features:
Add driver under Configuration/Drivers
Configure the Driver:
Name: PH
Type: ads1115
Address: standard is 72
Gain: 2/3, 1, 2, 4, 8 or 16
An Adafruit tutorial has this guidance.
# Choose a gain of 1 for reading voltages from 0 to 4.09V.
# Or pick a different gain to change the range of voltages that are read:
# - 2/3 = +/-6.144V (High Gain, Sensitive to noise)
# - 1 = +/-4.096V
# - 2 = +/-2.048V
# - 4 = +/-1.024V
# - 8 = +/-0.512V
# - 16 = +/-0.256V (Low Gain, Not Sensitive to Noise)
# See table 3 in the ADS1015/ADS1115 datasheet for more info on gain.
Reboot (Configuration/Admin)
Add analog input under Configuration/Connectors
Configure the connector
Name: PHpin0
Pins: 0 (depends what pin you use on the ADS1115 board)
Driver: PH
Reload (Configuration/Admin)
Add the probe under pH
Configure the PH probe
Name: PH
Analog input: PHpin0
Check frequency: 10
Ph status: Enabled
The other settings are not mandatory.
Calibration
The first readings will be high:
Therefore you need to calibrate!
To be able to calibrate you first have to disable the Ph status
Michael Lane has been working on a new ADS1015/ADS1115 driver for reef-pi.
This brings new possibilities to Reef-Pi:
- PH/Orp probes
- Pressure sensors
- Flow sensors
- Etc.
ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier
ADS1115 Features:
- Resolution: 16 Bits
- Programmable Sample Rate: 8 to 860 Samples/Second
- Power Supply/Logic Levels: 2.0V to 5.5V
- Low Current Consumption: Continuous Mode: Only 150µA Single-Shot Mode: Auto Shut-Down
- Internal Low-Drift Voltage Reference
- Internal Oscillator
- Internal PGA: up to x16
- I2C Interface: 4-Pin-Selectable Addresses
- Four Single-Ended or 2 Differential Inputs
- Programmable Comparator
Add driver under Configuration/Drivers
Configure the Driver:
Name: PH
Type: ads1115
Address: standard is 72
Gain: 2/3, 1, 2, 4, 8 or 16
An Adafruit tutorial has this guidance.
# Choose a gain of 1 for reading voltages from 0 to 4.09V.
# Or pick a different gain to change the range of voltages that are read:
# - 2/3 = +/-6.144V (High Gain, Sensitive to noise)
# - 1 = +/-4.096V
# - 2 = +/-2.048V
# - 4 = +/-1.024V
# - 8 = +/-0.512V
# - 16 = +/-0.256V (Low Gain, Not Sensitive to Noise)
# See table 3 in the ADS1015/ADS1115 datasheet for more info on gain.
Reboot (Configuration/Admin)
Add analog input under Configuration/Connectors
Configure the connector
Name: PHpin0
Pins: 0 (depends what pin you use on the ADS1115 board)
Driver: PH
Reload (Configuration/Admin)
Add the probe under pH
Configure the PH probe
Name: PH
Analog input: PHpin0
Check frequency: 10
Ph status: Enabled
The other settings are not mandatory.
Calibration
The first readings will be high:
Therefore you need to calibrate!
To be able to calibrate you first have to disable the Ph status
- Edit ph.
- Disable probe.
- Save
- Calibrate
- Rinse probe in rodi
- Place in 7 calibration fluid
- Wait for readings to stabilize
- Set cal value to 7 (Midpoint)
- Push Run
- Rinse probe
- Put in 10 calibration fluid
- Set cal value to 10 (Second Point)
- Run
- Enable probe
- Rinse probe and check both 7 and 10 and make sure it’s close.
I forgot to at a picture of the setup:Adding analog sensors with ADS1115
Michael Lane has been working on a new ADS1015/ADS1115 driver for reef-pi.
This brings new possibilities to Reef-Pi:
Any analog sensor can be used as long as the analog signal is in between 2.0V to 5.5V.
- PH/Orp probes
- Pressure sensors
- Flow sensors
- Etc.
ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier
ADS1115 Features:
I had an ADS1115 board so I tried if my PH probe is working. So I made a “How to guide” maybe it will be of use for others. I used a Raspberry Pi 2 Model B with Reef-Pi version 3.5.
- Resolution: 16 Bits
- Programmable Sample Rate: 8 to 860 Samples/Second
- Power Supply/Logic Levels: 2.0V to 5.5V
- Low Current Consumption: Continuous Mode: Only 150µA Single-Shot Mode: Auto Shut-Down
- Internal Low-Drift Voltage Reference
- Internal Oscillator
- Internal PGA: up to x16
- I2C Interface: 4-Pin-Selectable Addresses
- Four Single-Ended or 2 Differential Inputs
- Programmable Comparator
Add driver under Configuration/Drivers
Configure the Driver:
Name: PH
Type: ads1115
Address: standard is 72
Gain: 2/3, 1, 2, 4, 8 or 16
An Adafruit tutorial has this guidance.
# Choose a gain of 1 for reading voltages from 0 to 4.09V.
# Or pick a different gain to change the range of voltages that are read:
# - 2/3 = +/-6.144V (High Gain, Sensitive to noise)
# - 1 = +/-4.096V
# - 2 = +/-2.048V
# - 4 = +/-1.024V
# - 8 = +/-0.512V
# - 16 = +/-0.256V (Low Gain, Not Sensitive to Noise)
# See table 3 in the ADS1015/ADS1115 datasheet for more info on gain.
Reboot (Configuration/Admin)
Add analog input under Configuration/Connectors
Configure the connector
Name: PHpin0
Pins: 0 (depends what pin you use on the ADS1115 board)
Driver: PH
Reload (Configuration/Admin)
Add the probe under pH
Configure the PH probe
Name: PH
Analog input: PHpin0
Check frequency: 10
Ph status: Enabled
The other settings are not mandatory.
Calibration
The first readings will be high:
Therefore you need to calibrate!
To be able to calibrate you first have to disable the Ph status
Enjoy!
- Edit ph.
- Disable probe.
- Save
- Calibrate
- Rinse probe in rodi
- Place in 7 calibration fluid
- Wait for readings to stabilize
- Set cal value to 7 (Midpoint)
- Push Run
- Rinse probe
- Put in 10 calibration fluid
- Set cal value to 10 (Second Point)
- Run
- Enable probe
- Rinse probe and check both 7 and 10 and make sure it’s close.
.
OP
OP
Thank you for sharing this . Looks awesomeI forgot to at a picture of the setup:
.
. This opens up the possibility to tinker with all sorts of analog sensors (tds meters etc)I've always shied away from including a ph sensor due to the high cost for little perceived value, but with the ADC i could use cheap chinesium sensor+board kits for 20€ and maybe upgrade to a better probe later, how practicable is that?
Or would that be so useless that i shouldn't even bother?
Or would that be so useless that i shouldn't even bother?
Last edited:
I bought 3 amazon lights philzone, they have pwm led drivers, so all you need it to wire pwm and ground to pi..
I have one question about pwm. In the morning my blue channel is on 15% and it works, but in the evening I have them on 20%but they start to flicker.. helps if I increase percentage, but its too bright for moonlight.. Driver is set to 1000hz any ideas why this happens?
AbjectMaelstroM
Valuable Member
I bought 3 amazon lights philzone, they have pwm led drivers, so all you need it to wire pwm and ground to pi..
I have one question about pwm. In the morning my blue channel is on 15% and it works, but in the evening I have them on 20%but they start to flicker.. helps if I increase percentage, but its too bright for moonlight.. Driver is set to 1000hz any ideas why this happens?
Flicker is due to drivers not delivering enough power at the set %; the power delivery/pwm on these lights is pretty janky. The fact that it works on 15 but not at 20 is interesting. If you manually set to 20 does it still flicker? Or does it only flicker when it ramps down to 20% or 0%?
My viparspectra will flicker but only when ramping down from 1% to 0; the last 10-15 sec prior to lights cutting off (0) they'll flicker.
OP
OP
I am concerned about the quality of readings from such setup, but don’t have data to back this up. If you end up setting this up, It will be awesome if you share your findings.
From experience, the super cheap import sensors have terrible stability - you will probably need to figure in recalibration every week or so. I wouldn't use it as an active control element (CO2 dosing, calcium reactor), or make any changes based on the readings it gives you without some other test (which you shouldn't be doing anyway - don't chase pH directly). For some trends and basic monitoring with frequent calibration they'll work fine.
Hello, i've seen you implemented ADS1115 support in your project and that is a great thing. Only thing i want to ask is how many bits of data does the ADS1115 sends to the rpi via i2c ? Which is the format of that bits ? I've seen the reading from the pi is the bare fraction of voltage. I wanted also to point out that i tried the economic kind of analog ph-meter with very very poor results, i think for interference but im not sure.
OP
OP
2 bytes. Here is the code: https://github.com/reef-pi/drivers/blob/master/ads1x15/channel.go#L105
16 bits / 2 bytes. The value you get however depends on how you setup the ADC: which reference and which gain setting you use for the conversion.
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