[Curt White] is engaged on a smart pill whose copper-zinc battery will use his own stomach acid as the electrolyte. It’s not that uncommon of an concept, MIT examined the same strategy in a pig. It’s additionally higher than utilizing lithium ion batteries, one thing we covered in this PSA.
His start line is a small, hacked exercise tracker with its Nordic nRF51822 ARM Cortex-M0 and Bluetooth LE SoC. Most every thing else is eliminated. The battery electrodes are sewn onto a plastic mesh lower to the exercise tracker’s dimensions. Three coin sort tremendous capacitors and a lift converter sit between the battery and the SoC.
He makes use of the Bluetooth LE for communication, kind of. BLE units consistently transmit details about themselves and it’s this which you see when scanning for accessible units. Included in that transmission is a UUID (Universally Unique Identifier) and a reputation (e.g. “smartpillxyz”). He has the tablet transmit knowledge by placing it in that identify. This saves energy by minimizing the time which the tablet’s Bluetooth radio is turned on. The smartphone app extracts the information from these transmissions with out ever connecting.
His objective is to observe the voltage and the utmost present. This will inform him if his abdomen acid battery works and what could be powered by it. First checks will use regurgitated gastric fluid after which later he’ll swallow the tablet himself. As he places it, why not, “people swallow and pass all kinds of weird stuff without a problem.” Thay could sound cavalier however judging by his hackaday.io web page, he’s doing his homework.