wedontplay
Member
Hi everybody,
I’m using 150 Teensy 3.2 to do motion control for an interactive installation.
We have problem at boot. Randomly some board do not boot with the sketch.
Sometimes for the boards that do not boot pressing the reset button make them work, sometimes not.
To have them boot we have to power them multiple time.
All the board are powered with 3.3V provided by Murata OKI-78SR-3.3 DC/DC converter and connected in parallel to 3 main power lines with linear regulator that provide 24VDC on each line. When we power the system the booting behaviour is not consistent.
Some numbers:
We have 6 board out of 200 ordered that systematically don’t boot the program when we power the system.
To have them running we have to disconnect and reconnect them multiple times.
We have around 15 board out of 200 ordered that don’t boot the program around 1 time out of 10
To have them running we have to disconnect and reconnect them one time.
We have around 10 boards that don’t boot the program around 1 time out of 50
To have them running we have to disconnect and reconnect them one time.
The other boards are behaving correctly and boot all of the time.
All the teensy are mounted on a custom PCB and the PCB’s are machine assembled.
We checked the 3.3V power line with scopes and the rise time is the same when the board boot properly and when the board do not boot properly.
We have a 300ms delay as suggested in the forum as first line of setup function.
I would exclude a software problems since lot's of board boot every time and the software is the same.
We have also tried to load the blink example on the board that don't boot consistently and the behaviour is the same.
What is going on?
Best,
G.
I’m using 150 Teensy 3.2 to do motion control for an interactive installation.
We have problem at boot. Randomly some board do not boot with the sketch.
Sometimes for the boards that do not boot pressing the reset button make them work, sometimes not.
To have them boot we have to power them multiple time.
All the board are powered with 3.3V provided by Murata OKI-78SR-3.3 DC/DC converter and connected in parallel to 3 main power lines with linear regulator that provide 24VDC on each line. When we power the system the booting behaviour is not consistent.
Some numbers:
We have 6 board out of 200 ordered that systematically don’t boot the program when we power the system.
To have them running we have to disconnect and reconnect them multiple times.
We have around 15 board out of 200 ordered that don’t boot the program around 1 time out of 10
To have them running we have to disconnect and reconnect them one time.
We have around 10 boards that don’t boot the program around 1 time out of 50
To have them running we have to disconnect and reconnect them one time.
The other boards are behaving correctly and boot all of the time.
All the teensy are mounted on a custom PCB and the PCB’s are machine assembled.
We checked the 3.3V power line with scopes and the rise time is the same when the board boot properly and when the board do not boot properly.
We have a 300ms delay as suggested in the forum as first line of setup function.
I would exclude a software problems since lot's of board boot every time and the software is the same.
We have also tried to load the blink example on the board that don't boot consistently and the behaviour is the same.
What is going on?
Best,
G.