99Views9Replies

Author Options:

Want to make small heated wire with Raspberry Pi? Answered

OK, so here is the details. I am playing around with thermochromic pigment that changes colors at 92F I want to use a very thin wire to heat parts of it for a few seconds at a time. I have a Pi 3 and a portable battery that can supply 2.4A and 2A at 5V. I would love to power straight over the GPIO (max of 16mA per GPIO or (50 or 60mA across multiple) on the Pi but powering it from the battery (or another battery pack) and controlling with the Pi would be fine too. Any ideas? I currently trying to see what it would take to heat something like this https://www.amazon.com/dp/B000FMYBMQ/ref=biss_dp_t_asn

Discussions

0
None
ams31

2 years ago

I would suggest using a 5 volt relay the main advantage of using a relay is it provides isolation (keeping your Rpi safe) and also provides options for providing high current (upto 5-7 ampere) without getting heated. You should not drive a relay directly via Rpi so a relay driver circuit is required for interfacing relay to raspberry pi.

0
None
TylerW97ams31

Answer 2 years ago

Awesome, thank you for the info.

0
None
TylerW97iceng

Answer 2 years ago

Thanks, I'll take a look at that.

0
None
icengTylerW97

Answer 2 years ago

Click the picture to see the whole image.

0
None
TylerW97rickharris

Answer 2 years ago

Thanks I will take a look at that. I have the Pi because it is flexible and powerful, so I can use it for a lot of different projects. However if I could replace the Pi with that in this project that would be great.

0
None
steveastrouk

2 years ago

Its a very silly thing to do directly. You need some external electronics, probably something like a ULN2803 to do it reducing the risk of blowing your Pi up.

https://www.adafruit.com/product/970

0
None
TylerW97steveastrouk

Answer 2 years ago

Makes Sense. Thanks for the info, if I could even do something like using AA or 9V Batteries and some way to control the timing via the Pi would work great to. I simply am not sure what to search for.