Go Down

Topic: Connecting Teensy with a battery (Read 1 time) previous topic - next topic

dubz

Hi!
I am reading this but I dosn't understand it very well: http://www.pjrc.com/teensy/external_power.html
Will this battery work http://www.sparkfun.com/products/338 ? My teensy shall just blink a little when pressing on a button. (4 buttons, 4 leds).
I can not have big battery as shown on the image.

Best regards!

dc42

The CR2032 is specified at 0.2mA continuous current (see http://www.houseofbatteries.com/documents/CPN-CR2032), so running LEDs off it is way over its design spec. It might just work though. You can buy these cells at many supermarkets.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

dubz

#2
Aug 09, 2011, 08:07 pm Last Edit: Aug 09, 2011, 08:15 pm by dubz Reason: 1

The CR2032 is specified at 0.2mA continuous current (see http://www.houseofbatteries.com/documents/CPN-CR2032), so running LEDs off it is way over its design spec. It might just work though. You can buy these cells at many supermarkets.
Hmm okey I see, but which battery here would you take?
http://www.sparkfun.com/search/results?term=battery&what=products

Either a coin battery or a small Lithium Ion battery.
Thanks for the help!
Best regards!

Edit: Alright if we take the leds away and just uses the button.
If a make a keypad on 4 buttons (1,2,3,4) which battery will work then? The pushed button will be saved in EEPROM storage.

dc42

I think I'd try the CR2032 first. Although it is intended for low-current applications, I've just connected one to a LED using a 220 ohm series resistor, and the LED lights up fine.

The lithium ion battery would also be a good bet, but you will need exactly the right charger for it.

Just bear in mind that any lithium-based battery can decide to self-destruct and get rather hot if it doesn't like what you are doing to it.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy