On-Screen Battery Monitor Options

[joeygbsn]

Hey just wanted to let you know that I finally had a chance to reinstall hoolyhoo's script and use it with the ads1115. I can confirm that the only changes needed are changing line 24 to adc = Adafruit_ADS1x15.ADS1115() and changing line 55 to voltage = float(sensorValue) * (4.09 / 32767.0). At first i thought the range wasnt right because i was getting readings of ~2.6V but when I double checked with my meter the voltage actually was 2.6v on the 3.3v rail from the raspberry pi. I was powering my BW screen off of the 5V rail and it was causing a lot of voltage drop. It's drawing 350mA. I switched it to a separate 5V supply and my readings went up to 3.3V along with all my voltages.

[VeteranGamer]

I have one of the 16bit boards so may be able to test the script at some point if I have time. Looking at the code though I think that you only need to change one line. Change adc = Adafruit_ADS1x15.ADS1015() to adc = Adafruit_ADS1x15.ADS1115() and I think it will work.

You would also need to change the resolution as of right now the range is from -2048 to 2047. The 16bit uses a resolution from -32768 to 32767.

Editing the 2047 to 32767 in this bit of the script might be all thats needed other than the what joeygbsn mentioned.

Code: Select all

def convertVoltage(sensorValue):
    voltage = float(sensorValue) * (4.09 / 2047.0)
    return voltage

Noob question.....

i've got a couple ADS1015 and a couple of ADS1115 in hand now......
i know the ADS1015 (if wire correctly) only needs the script installed and is good to go....


i want to try the ADS1115

after i wire it up and install the script

how do i go about editing the script, so thats it more geared towards the 16bit chip....

a complete noob in this department, so as much info as possible would be appreciated.....

Thanks.


.

[HoolyHoo]

I have one of the 16bit boards so may be able to test the script at some point if I have time. Looking at the code though I think that you only need to change one line. Change adc = Adafruit_ADS1x15.ADS1015() to adc = Adafruit_ADS1x15.ADS1115() and I think it will work.

You would also need to change the resolution as of right now the range is from -2048 to 2047. The 16bit uses a resolution from -32768 to 32767.

Editing the 2047 to 32767 in this bit of the script might be all thats needed other than the what joeygbsn mentioned.

Code: Select all

def convertVoltage(sensorValue):
    voltage = float(sensorValue) * (4.09 / 2047.0)
    return voltage

Noob question.....

i've got a couple ADS1015 and a couple of ADS1115 in hand now......
i know the ADS1015 (if wire correctly) only needs the script installed and is good to go....


i want to try the ADS1115

after i wire it up and install the script

how do i go about editing the script, so thats it more geared towards the 16bit chip....

a complete noob in this department, so as much info as possible would be appreciated.....

Thanks.


.

If you installed the original script to your pi then you could just ssh and edit using nano (ex. sudo nano pathoffile/file). Then it’s just a matter of changing the values mentioned above and then saving the file. Keep in mind that with python, indents matter so make sure those stay as is. Simply then, reboot, and hopefully it should work for you.

[joao]

Hi HoolyHoo, if I use the same ADS1015 for battery monitor (channel 2) and joystick (channel 0 and 1). Using both your script (changing the readVoltage() function to read channel 2) and the Joy Bonnet from Adafruit, the system starts giving me wrong values and due to this I get a shutdown even with full battery.
Do you have any ideas how can I solve this?

[HoolyHoo]

Hi HoolyHoo, if I use the same ADS1015 for battery monitor (channel 2) and joystick (channel 0 and 1). Using both your script (changing the readVoltage() function to read channel 2) and the Joy Bonnet from Adafruit, the system starts giving me wrong values and due to this I get a shutdown even with full battery.
Do you have any ideas how can I solve this?

I suspect there may be a conflict as they are both accessing the ADS1015. I used Adafruit's library for the chip which made it easy to read while the joy bonnet script accesses the ADS1015 in script without library. I would try to merge the script so that its all in one either using the library or as in the joy bonnet script.

[joao]

Thank you. That was also my idea. Now I just need to see if I can do it
And thanks for sharing the script.

[Lpoolm]

has this been mentioned/used?
https://fr.aliexpress.com/item/1S-Singl ... 0.0.ferk1G

i saw it on a french youtube build guide

20171214_182413.jpg (6.21 MiB) Viewed 10077 times

[VeteranGamer]

has this been mentioned/used?
https://fr.aliexpress.com/item/1S-Singl ... 0.0.ferk1G

i saw it on a french youtube build guide
20171214_182413.jpg

not really on-screen....

i have seen those....
and i've seen them in some builds (dont look great, IMHO)
and i think they're impractical, you have to turn the system around to see what you've got left....
and you have to accommodate another bit of hardware.....

but its an option if people want there builds to look like that.....


.

[joeygbsn]

Continuing the conversation from the other thread...
While it my not be an ideal situation, it seems like just powering the module from 5v without removing any pull-ups should work fine. The raspberry has 1.8k ohm pull-up resistors to 3v3 on the sda and scl lines on board. The module has 10k pull-ups to 5v on the same sda and scl lines. So the actual circuit for one of the lines is something like this:

IIC.PNG (10.11 KiB) Viewed 9848 times

I used 5.11v because that's what i measured with my DVM. Simulating this we get around 3.58v on the data line:

Graph.PNG (26.83 KiB) Viewed 9848 times

I have verified this with my DVM I'm seeing 3.58v. Seeing as its not very high above the 3.3v rating of the pi's pins it seems like it wont hurt anything. This does work perfectly so far on my breadboard.

[erik_gee]

Continuing the conversation from the other thread...
While it my not be an ideal situation, it seems like just powering the module from 5v without removing any pull-ups should work fine. The raspberry has 1.8k ohm pull-up resistors to 3v3 on the sda and scl lines on board. The module has 10k pull-ups to 5v on the same sda and scl lines. So the actual circuit for one of the lines is something like this:
IIC.PNG

I used 5.11v because that's what i measured with my DVM. Simulating this we get around 3.58v on the data line:
Graph.PNG

I have verified this with my DVM I'm seeing 3.58v. Seeing as its not very high above the 3.3v rating of the pi's pins it seems like it wont hurt anything. This does work perfectly so far on my breadboard.

Thanks for the info! I'm making a control board rright now with an ads1115/1015 circuit integrated. I placed a 1n4001 diode in series with the 5v vdd to (theoretically) drop down to around ~~ 4.3v . So that the output is below the 3.3v required of the pi. If there is a flaw in my logic please let me know haha