There are multiple power options when it comes to powering up DUELink modules. However, many of these modules consume very little power. Not only that, the standard library include low power options. MicroBlocks standalone programs also have shutdown feature.
The micro used on all modules can run at low voltages, under 3V. This allows it to run directly from a 3V coin cell battery. Note that some modules have additional components that may not work at lower voltage. And some modules need more power than what a coin-cell can provide. Board like Ghizzy or Ghizzy Jr are good candidates.
To wire the coin-cell, we used a holder with a built in switch. Those are available online, like on Amazon.
We connected the 2 wires to the DUELink pin-wire cable we offer.
A quick test shows it is working.
We can cut the wires short to make it neater.
Add a blue phone lanyard and you are ready to show it off!
Important notes: Do not put a powered circuit in your pocket. Do not give the circuit multiple power sources. For example, plugging Ghizzy into USB will put 3V on the Downlink connector, that is feeding 3V into the battery! This might cause the battery to overheat, leak, or worse! Do not use any battery that is not 3V. For example, rechargeable batteries can be 4.7V. This post is only to give you options but the recommended path is to power the circuit from USB, including USB power banks.
