My teensy just caught fire... literally!
I'm trying to understand what happened and I hope someone here can help me.
I had the teensy on my breadboard with a small circuit while I was writing code on my MacBook Pro. Everything was working fine for a couple of hours until my laptop was running out of power and I plugged in the charger and *POOF* ... flame and smoke from the MCU on the teensy. I wasn't really doing much with the circuit... just messing around with the code. The teensy was powered from USB and I had no other power source on the breadboard.
I checked my breadboard for shorts afterwards but found none (resistance between VCC and GND is 2k ohm). I guess there could have been a short between 2 pins on the MCU itself (I was fixing a bad solder joint on the pin header I put on the Teensy earlier today) but then why didn't my circuit misbehave when I was running off the laptop battery?
I wonder if something could be wrong with the laptop or charger? Normally, my macbook will disable USB ports that draw too much current but that didn't happen here, even though it took me several seconds to disconnect the burning teensy. Also, I charged my laptop (with the teensy removed) after the incident and got a small electric shock when I touched the charger plug to remove it from the socket (I was wearing sneakers, so I guess it could have been worse). This is a german style plug that exposes GND on the sides of the plug "casing", so I'm guessing that's where the shock came from.
I'm trying to understand what happened and I hope someone here can help me.
I had the teensy on my breadboard with a small circuit while I was writing code on my MacBook Pro. Everything was working fine for a couple of hours until my laptop was running out of power and I plugged in the charger and *POOF* ... flame and smoke from the MCU on the teensy. I wasn't really doing much with the circuit... just messing around with the code. The teensy was powered from USB and I had no other power source on the breadboard.
I checked my breadboard for shorts afterwards but found none (resistance between VCC and GND is 2k ohm). I guess there could have been a short between 2 pins on the MCU itself (I was fixing a bad solder joint on the pin header I put on the Teensy earlier today) but then why didn't my circuit misbehave when I was running off the laptop battery?
I wonder if something could be wrong with the laptop or charger? Normally, my macbook will disable USB ports that draw too much current but that didn't happen here, even though it took me several seconds to disconnect the burning teensy. Also, I charged my laptop (with the teensy removed) after the incident and got a small electric shock when I touched the charger plug to remove it from the socket (I was wearing sneakers, so I guess it could have been worse). This is a german style plug that exposes GND on the sides of the plug "casing", so I'm guessing that's where the shock came from.