Hi guys.
I’m working on a project involving a HC-05 bluetooth module (3.6V-6V)and an Arduino Nano transmitting some data from a temperature sensor live to my phone. I’d like to affix these to a wristband so I can wear the it, however I’m seeing some conflicting information as to the best way to power such a system.
I’ve seen the following options and would be grateful if someone could tell me which one makes the most sense:
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3 LR44 button cell batteries in series generates 4.5V but only 105mAh
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A 3.7V. 580mAh LiPo battery BatterySpace.com/AA Portable Power Corp. Tel: 510-525-2328 - Wearable Rechargeable Cells
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A single 3V 250mAh CR2032 with a Pololu 5V Step-Up Voltage Regulator (https://www.pololu.com/product/798)
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A thin LiPo as seen here: Thin (1 mm to 2mm) to Ultrathin (0.5 mm) Rechargeable Lithium Polymer Cells from PowerStream although the highest capacity I am seeing available is 130mAH
The system needs to transmit data for less than one hour. I’m happy to change the batteries at that stage. I’d prefer it if the battery were very light, as I don’t want the wristband moving too much and jostling the sensor as a result of the mass of the battery if I move my arm rapidly.
Can someone let me know which of the above would best fit the requirements? Would all entries on the above list work to power the Nano and Bluetooth module for less than an hour?