For the adventerous, you can assemble the majority of the badge yourself with a steady paw and soldering iron. Hopefully you can find enough details here to bring your badge to life.
| Designator | Quantity | Part Number | Description |
|---|---|---|---|
| IC1 | 1 | STM32F411RET6 | STM32F4 Microcontroller |
| IC2 | 1 | AAT1217ICA-3.3-T1 | Boost Converter |
| IC3 | 1 | MMA7660FCR1 | Accelerometer |
| IC4 | 1 | MIC5504-3.3 | 3.3V LDO Regulator |
| IC5 | 1 | EYSGCNZWY | Bluetooth Low Energy Module |
| IC6 | 1 | MX25L3206EZNI-12G | 32Mbit SPI flash |
| IC7 | 1 | IQS231A-00004000TSR | Capacative Touch Controller |
| IC8 | 1 | MC74VHC1G04DTT1G | 74AHC1G04 Single Inverter |
| C2,C3,C8,C13,C14,C15,C16 | 7 | C1608X5R1C475MAC | 4.7uF MLCC Capacitor |
| C1,C4,C5,C6,C9,C10,C17 | 7 | C0603C104J4RACTM | 0.1uF MLCC Capacitor |
| C7,C11,C12 | 3 | GCM1885C1H120JA16D | 12pF MLCC Capacitor |
| RN1 | 1 | CAT16-331J4LF | 4x330 Ohm Resistor Array |
| RN3 | 1 | CAT16-472J4LF | 4x4.7k Ohm Resistor Array |
| R1,R2,R4 | 3 | ERJ-1GNJ471C | 470 Ohm 0603 Resistor |
| R8 through R25 | 18 | ERJ-3EKF2700V | 270 Ohm 0603 Resistor |
| D1-0 through D7-18 | 112 | 150060GS75000 | 525nm Green 0603 LED |
| Q1 through Q7 | 7 | DMG2305UX-7 | SOT-23 P-Channel MOSFET |
| D1 | 1 | PRTR5V0U2X | ESD Protection Diode |
| D2 | 1 | LTST-C19HE1WT | RGB Status LED |
| D3 | 1 | BAS16GWX | SOD-123 General Purpose Diode |
| Y1 | 1 | ABM10-166-12.000MHz-T3 | 12MHz Crystal Oscillator |
| L1 | 1 | LQM21PN2R2MCHD | 2.2uH Inductor |
| J1 | 1 | 10118193-0001LF | USB Micro-B Connector |
| SW1,SW2 | 2 | 434331045822 | Tactile Switch |
| BT1 | 1 | BC12AAPC | 2xAA Battery Holder |
The LEDs for the front matix, denoted D1-0 through D7-18 can be substituted for any color of your choosing as long as it's in an 0603 footprint. If you make a substitution of the LEDs you must chose an appropriate value for reisistors R8-R25 to match the forward voltage of your LED.
Using the LED forward voltage and current, the resistance is given by Ohm's Law
R = (3.3 - Vf) / I However, you may find the badge exceptionally bright, and it's
better to use lower current. For the production badges we aimed for 5mA of current
270 ohms = (3.3V - 2.7V) / 4.5mA.
The following images demonstrate the locations of the components on the back of the badge.
Once all the parts of the bottom of the badge are soldered in place, you can test the board by flashing the firmware via USB/DFU and then verifying that you can connect to the python REPL.
As a word of warning, the EYSGCNZWY Bluetooth module is very difficult to solder by hand, you will have your best chance of success using solder paste and a reflow oven. However, the BLE module is not required for the correct operation of the badge.
All of the LEDs on the front of the badge are oriented with the anode (positive) end of the LEDs oriented towards the top of the badge, and the cathode (negative) end of the LED towards the bottom of the badge.
