Goal is to build a device that will record conversations, save them on the device, and sync to an iOS based.
The battery life needs to support ~3-4hours of conversation recording (ideal would be 6 hours)
Form factor will be important and will need to be somewhere in (65mm x 35mm) range.
Some thoughts on what a POTENTIAL (Please improvise) solution can be,
1. The core processor would be an ESP32, which has both BLE and WiFi capabilities. Also it has a good community driven libraries. (The bare module is 1.9cm/2.6cm in size)
2. Add to it another set of LiPo -HiPo, based on need, charger.
3. Add a storage SD slot
4. Battery like: [login to view URL]
5. Another great way would be to use an NRF5x that would be much smaller and more power friendly. [login to view URL] for size reference
Attached some info / calcs for the above.
Steps and milestones will be:
0. Sourcing the NRF52DK, I2S microphone
1. Program for mic and NRF52 to record voice
2. Program to save recorded data to SD card as byteStream
3. Program to send data from SD card to BLE target device
4. Add battery and charging circuit for testing
5. Build final schematics if 1-4 work as expected
6. Build PCB as per dimensions agreed upon
7. Prototyping of the device at a fab house, as per fab house actuals
8. 3-D printed case, as per fab house actuals
9. Test and final deliverables
25 freelance font une offre moyenne de $762 pour ce travail
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We can work like the milestones specified by you in the requirements but will take weeks of time to complete all the mile stones