Having Trouble Connecting R503 Fingerprint Sensor to Arduino

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DeanEinGrey
 
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Having Trouble Connecting R503 Fingerprint Sensor to Arduino

Post by DeanEinGrey »

Hi all.

Firs hurdle that I need to clear is that the Arduino IDE doesn't seem to be picking up the sensor in the Serial Monitor.

I know that I have everything hooked up correctly to the breadboard and Arduino, but I'll include pictures just in case what I know is wrong.

Thanks for your help,
Dean
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mikeysklar
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by mikeysklar »

Dean,

The connector cables look a bit rough (solder points at breadboard pins), but I think the place to start here is with the 5v and GND connection not being shown in your Arduino photo.
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DeanEinGrey
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by DeanEinGrey »

Hi Mickey and thanks for the reply.

As it turns out, that wasn't the problem.

I spent most of last night thinking that I had overlooked that, and possibly wasn't getting power, but I just hooked everything up again and still have nothing.

Thanks for trying to help, though.

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mikeysklar
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by mikeysklar »

Which sketch are you attempting to run?

Can you post an updated photo of your wiring?

It would probably be a good idea to verify with a multimeter that you connections from the Arduino to to the fingerprint sensor are complete as they look fragile.

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DeanEinGrey
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by DeanEinGrey »

I'm working on a re-solder right now. Will post new photos if problem persists.

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DeanEinGrey
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by DeanEinGrey »

Hi Mickey.

I don't have a multimeter, but I did re-solder my connections and the arduino IDE is still no finding the sensor.

I'm using the Enroll script recommended by Adafruit.

Sending a new photo of wiring with this message.
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jerryn
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by jerryn »

Check the R503 user manual https://cdn-shop.adafruit.com/product-f ... manual.pdf
The wires colors are different. The green and yellow are the serial lines (Rx/TX) , the white is not used.

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mikeysklar
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by mikeysklar »

Good find on the coloring change and this new setup you have put together looks more stable.

Looking at the Wiring it appears that you are still running a connecting wire from the R503 white (unused) or am I seeing some breadboard alignment confusion from the photo?

The connections from the R503 we need to focus on for a moment are

yellow (out) ---> Arduino UNO (pin #2 software RX)
green (in) --> Arduino UNO (pin #3 software TX)
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DeanEinGrey
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by DeanEinGrey »

jerryn wrote:Check the R503 user manual https://cdn-shop.adafruit.com/product-f ... manual.pdf
The wires colors are different. The green and yellow are the serial lines (Rx/TX) , the white is not used.
Thanks for the information, Jerryn.

I actually decided to play around with the wiring, after testing the signal flow with a multimeter, and found that to be the case.

I'm still having a bit of an issue getting the LED ring to light up when it senses a fingerprint. I've looked at the manual and can't really find any helpful information on that topic besides that wire 6 is the touch indication power supply.

If you've got any information on that, I'd greatly appreciate it.

Thanks,
Dean

P.S.: I'm sending an updated picture of my wiring minus the connections that I tried to make for the 5 and 6 wires (blue and white, respectively) because nothing of what I tried worked.
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jerryn
 
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Re: Having Trouble Connecting R503 Fingerprint Sensor to Ard

Post by jerryn »

The LED Ring id controlled by a command to the sensor, not the wires.
In the manual scroll down to the 'Aura Control" section - Instruction code 0x35

For Arduino , it appears to be controlled by this function https://github.com/adafruit/Adafruit-Fi ... t.cpp#L339
I have not used it with Arduino myself.
I use it with CircuitPython.
In the CircuitPython Library, it is controlled here https://github.com/adafruit/Adafruit_Ci ... nt.py#L323


I hope that helps.

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