Shivasongster
Active member
Looking for some help with solving a rather odd power issue I'm having with a somewhat multi-layered project.
The main components are:
1. Teensy 3.2
2. Teensy Audio Board
3. Adafruit TS2012 Amp (physically separate circuit)
4. SparkFun RGB and Gesture Sensor - APDS-9960
https://www.sparkfun.com/products/12787
5. Also some touch sensors: 1.8 V – 5.5 V; 17 µA at 1.8 V typical
Prototype using battery powered speakers in place of the TS2012, and using USB 5V power adapter for Teensy/Audio combo works great. All sensors work as they should. But I don't want to use battery powered speakers - want everything to run from a single power supply. When I tried to move this project over to a self-contained unit with its own power supply for both Teensy and the TS2012 amp, I ran into issues.
My dad helped me with a power supply which is a basic 9V 650 mAh wall adapter to a 7805 regulator, split out to two 5v rails (let's call them A and B) that have been separated using 1N4005 diodes. We started with 10 Ohm resistors, but we went with diodes for more isolation/protection. Everything checks out on a meter for both 5v rails (A & B), and no shorts.
When I power the Teensy/Audio Board with rail A, and power the TS2012 Amp with rail B, things work... sort of. The amp works great. I get sounds off the Teensy setup, but the APDS-9960 doesn't appear to fire up and stops working. The gesture sensor is max 3.8v, and I have verified it is getting 3.3v.
As soon as I move back to the USB power, everything runs fine, including the gesture sensor. This leads me to believe that the circuit is not getting enough power, but I don't know what to try next. I've been through the project eliminating several potential wiring issues, rechecking. I have blown one Teensy 3.2 board in the process because of an exposed voltage wire that I tracked down too late. Even with a fresh Teensy, this power issue persists.
I read elsewhere on the forum that Teensy 3.2 + Teensy Audio Board are about 91mA.
I can't be the first person to try something like this, so what are people's experiences and recommendations for powering Teensy projects + other stuff along with it?
(Attachment upload isn't working, so I was unable to send schematic of power supply)
The main components are:
1. Teensy 3.2
2. Teensy Audio Board
3. Adafruit TS2012 Amp (physically separate circuit)
4. SparkFun RGB and Gesture Sensor - APDS-9960
https://www.sparkfun.com/products/12787
5. Also some touch sensors: 1.8 V – 5.5 V; 17 µA at 1.8 V typical
Prototype using battery powered speakers in place of the TS2012, and using USB 5V power adapter for Teensy/Audio combo works great. All sensors work as they should. But I don't want to use battery powered speakers - want everything to run from a single power supply. When I tried to move this project over to a self-contained unit with its own power supply for both Teensy and the TS2012 amp, I ran into issues.
My dad helped me with a power supply which is a basic 9V 650 mAh wall adapter to a 7805 regulator, split out to two 5v rails (let's call them A and B) that have been separated using 1N4005 diodes. We started with 10 Ohm resistors, but we went with diodes for more isolation/protection. Everything checks out on a meter for both 5v rails (A & B), and no shorts.
When I power the Teensy/Audio Board with rail A, and power the TS2012 Amp with rail B, things work... sort of. The amp works great. I get sounds off the Teensy setup, but the APDS-9960 doesn't appear to fire up and stops working. The gesture sensor is max 3.8v, and I have verified it is getting 3.3v.
As soon as I move back to the USB power, everything runs fine, including the gesture sensor. This leads me to believe that the circuit is not getting enough power, but I don't know what to try next. I've been through the project eliminating several potential wiring issues, rechecking. I have blown one Teensy 3.2 board in the process because of an exposed voltage wire that I tracked down too late. Even with a fresh Teensy, this power issue persists.
I read elsewhere on the forum that Teensy 3.2 + Teensy Audio Board are about 91mA.
I can't be the first person to try something like this, so what are people's experiences and recommendations for powering Teensy projects + other stuff along with it?
(Attachment upload isn't working, so I was unable to send schematic of power supply)
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