A portable wrist pose controlled electrocutaneous stimulator. Part of an undergraduate thesis.
Operates on an ESP32, and communicates with a companion app built on Blynk via BLE.
If you'd like to make your own, see the build instructions here.
The following is a basic system diagram showing the various elements of the design and how they relate to one another:
| Item | Part Number | Supplier | Cost | Quantity | Total Cost |
|---|---|---|---|---|---|
| Microcontroller (Adafruit ESP32 Feather) | 3405 | Adafruit | R299.25 | 1 | R299.25 |
| IMU (6 DOF) | SEN-00138 | Netram | R126.05 | 2 | R252.10 |
| Boost Convertor (12-200V, 60mA) | NCH6100HV | Amazon | R284.85 | 1 | R284.85 |
| Buck Convertor (12-3.3V, 2A) | MP1584 | Communica | R45.00 | 1 | R45.00 |
| NPN Transistor | MJE340 | Farnell | R10.66 | 1 | R10.66 |
| P-Channel MOSFET (400V, 3.5A) | FQP4P40 | Farnell | R22.72 | 3 | R68.15 |
| SD Card Reader (Wemos D1 Mini RTC/Data Logger Shield) | Communica | R82.61 | 1 | R82.61 | |
| Battery Manager (Comidox 3S, 12.6V, 10A) | Amazon | R38.95 | 1 | R38.95 | |
| Resistor (Through-hole, 25mW, 1k) | UCT | R0.00 | 4 | R0.00 | |
| Resistor (Through-hole, 25mW, 2k2) | UCT | R0.00 | 2 | R0.00 | |
| Resistor (Through-hole, 25mW, 3k3) | UCT | R0.00 | 1 | R0.00 | |
| Resistor (Through-hole, 25mW, 10k) | UCT | R0.00 | 1 | R0.00 | |
| LED (Red, 5mm, 20mA) | UCT | R0.00 | 1 | R0.00 | |
| LED (Green, 5mm, 20mA) | UCT | R0.00 | 1 | R0.00 | |
| Fuse (glass, 30mA) | UCT | R0.00 | 1 | R0.00 | |
| Fuse holder | UCT | R0.00 | 1 | R0.00 | |
| 3.7V Li-Ion Battery | UCT | R0.00 | 3 | R0.00 | |
| Small On/Off Switch | COM-00652 | Netram | R15.00 | 1 | R15.00 |
| JST Connector (1A, 2 pin, female, 14cm) | Communica | R3.04 | 4 | R12.17 | |
| JST Connector (1A, 2 pin, male, 14cm) | Communica | R3.04 | 4 | R12.17 | |
| Heat Shrink (Various colours, 1/8") | Communica | R0.44 | 3 | R1.32 | |
| Header Connector (5 pin, female, 2.54mm, L, locking) | XY136-05RT | Communica | R0.91 | 2 | R1.82 |
| Header Connector (5 pin, male 2.54mm, locking) | XY136-05HT | Communica | R1.45 | 2 | R2.90 |
| Header Connector (2 pin, female, 2.54mm, L, locking) | XY136-02RT | Communica | R0.31 | 2 | R0.62 |
| Header Connector (2 pin, male 2.54mm, locking) | XY136-02HT | Communica | R0.55 | 2 | R1.10 |
| Ribbon Cable (10-way, 1m) | Communica | R7.36 | 0.1 | R0.74 | |
| Any small jumper cable (comms core will do, 1m) | UCT | R0.00 | 1 | R0.00 | |
| Strip Board (2.54mm pitch, 100x300mm) | UCT | R70.00 | 1 | R70.00 | |
| 3D Printing | R120.00 | 1 | R120.00 | ||
| Total | R1,319.40 |