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Post by ryazbeck on Jun 1, 2020 13:10:53 GMT -8
I have the Switchdoc grove connector hat and the Switchdoc ADC/ADS1115 running on a raspberry pi zero w. I have an analog light sensor hooked to the ADC A1 port and it works fine I have the two capacitive soil moisture sensors hooked to the ADC, one is using A0 on the pins and one is using the grove A2 port. Neither are generating voltage to the rPi. When I move the moisture sensor's VCC from the VCC pin on the ADC to the 3.3v pin on the pi it starts to generate voltage, but it's unreliable (it moves very slowly in the correct direction, but takes 40+ seconds to get to the correct reading). If i add a 1M ohm resistor between the Analog and GND it works as expected. Any ideas? edit: maybe this sensor is not built properly. here's someone else with a similar problem forum.arduino.cc/index.php?topic=655776.0solved: The sensors I bought on amazon were malfunctioning. I received the Switchdoc Sensors and they work perfect. Don't buy sensors from Amazon unless they are Switchdoc's  |
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Post by SDL on Jun 1, 2020 14:46:35 GMT -8
Hmm. Are these our Capacitive Moisture Sensors? If so, are you using the supplied cables? I'm wondering because I don't see you can move the VCC pin to another VCC pin using our cables.
It you got them from somewhere else, you will need to check your wiring to the Pi2Grover very closely. Not all of these moisture sensors are wired the same way.
Send a picture and that will help.
BP
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Post by ryazbeck on Jun 1, 2020 15:05:58 GMT -8
I crimped my own connector and aligned them according to the Switchdoc guide here. www.switchdoc.com/wp-content/uploads/2016/05/Grove4ChADC_CurrentSpecification.pdfThe terminals are are labeled on both ends, so it's straight forward: aout(sensor)>pin1 on ADC grove port A0 ADC A0-pin2 untouched (there is not a 2nd analog pin on the sensor) vcc>vcc (pin3) gnd>gnd (pin4). If this weren't correct then the sensor wouldn't work at all, right? Because it works fine if I use 3.3 and a resistor. Other than the above schematics everything is as you would expect. i.imgur.com/DLyjPKv.jpg |
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Post by SDL on Jun 1, 2020 15:11:47 GMT -8
The problem is the capacitive sensor itself (I'm guessing here). Our capacitive sensors work with our cables. I'm not trying to be a problem here, but where did you get the capacitive sensors? These are ours (with cable) and we have sold 100's of these: shop.switchdoc.com/products/capacitive-plant-moisture-sensor-groveI'm pretty sure it isn't the ADC as what you say indicates it is working! Hope this of some help. Again take a picture and let me see the wiring. There are more than one manufacturer of these over in China. BP |
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Post by ryazbeck on Jun 1, 2020 15:20:30 GMT -8
The problem is the capacitive sensor itself (I'm guessing here). Our capacitive sensors work with our cables. I'm not trying to be a problem here, but where did you get the capacitive sensors? These are ours (with cable) and we have sold 100's of these: shop.switchdoc.com/products/capacitive-plant-moisture-sensor-groveI'm pretty sure it isn't the ADC as what you say indicates it is working! Hope this of some help. Again take a picture and let me see the wiring. There are more than one manufacturer of these over in China. BP Hey, sorry, I edited my post to show the pic, here it is: i.imgur.com/DLyjPKv.jpgmy ground is black>white>brown from the sensor ( ) |
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Post by ryazbeck on Jun 1, 2020 15:27:42 GMT -8
I went ahead and ordered the sensor you linked me to. I'll report back when I hook it up.
Thanks for your help so far!
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Post by SDL on Jun 1, 2020 15:28:35 GMT -8
Let's start with that I know We know the ADC works. It has to be the sensors (unless you have blown something, which is always a possibility! You should see our Box of Death).
Question) Where did you get these sensors? Are they from us?
BP
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Post by ryazbeck on Jun 1, 2020 15:46:12 GMT -8
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Post by SDL on Jun 1, 2020 15:48:36 GMT -8
Sorry, we have no idea if those work or not. I see you just bought one from us. Let us know if that works for you. We can help you with that one!
Don't mix them up. They may look the same, but they probably aren't.
BP
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