WPT TX
About the WPT TX PCB
WPT TX is an open source Microchip SAM PCB design by mark-belbin, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 100 × 45 mm, with 117 components from 46 distinct parts.
Its main chip is the ATSAMD21G16B-MFT, from the Microchip SAM family. Other key parts include the INA240A1D, LM2937IMP-3.3, LM2936-5.0, LM2937IMP-12 and LMC6032. By type, the board carries 37 capacitors, 29 resistors, 13 ICs, 12 test points, 10 connectors and 9 diodes.
It belongs with the iot & wireless and power & battery designs in this gallery.
From the project
A simple two-board wireless power system that can transmit up to 100W at close distances. Originally designed as a small part of a subsea resident autonomous underwater vehicle senior design project. Included are schematics, PCB design files, LTspice simulations, and embedded code.
However, since a lot of work was already being placed into research and simulation anyways, it was decided to try and create a resonant system. Using capactiors, resonant circuits can be created with the inductive transmitter and reciever coils, increasing efficiency accross the wireless link. This is the de facto inductive wireless power transfer method used in industry, and it turned out to be simpler than thought. The topology chosen is called "series-series" resonant inductive wireless power transfer, which means that the compensating capacitors are placed in series with both the transmit…
Main components on the WPT TX
WPT TX bill of materials (BOM)
117 components, 46 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | INA240A1D | SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | LM2937IMP-3.3 | SOT-223-3_TabPin2 | U2 |
| 1 | LM2936-5.0 | SOT-223-3_TabPin2 | U3 |
| 1 | LM2937IMP-12 | SOT-223-3_TabPin2 | U4 |
| 1 | LMC6032 | SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | CD4043BDR | SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 1 | BTS6142DAUMA1 | TO-252-4 | U7 |
| 1 | SN74LVC1G14DBV | TSOT-23-5 | U8 |
| 1 | ATSAMD21G16B-MFT | QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U9 |
| 2 | LM5106 | LM5106SD | U10, U13 |
| 1 | MCP2515-QFN20 | QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm_ThermalVias | U11 |
| 1 | MCP2562-E-MF | DFN-8-1EP_3x3mm_P0.65mm_EP1.55x2.4mm | U12 |
| 4 | 448-IAUC70N08S5N074ATMA1 NMOS | TDSON-8-1 | Q1, Q2, Q3, Q4 |
| 1 | 32.7680KHZ 32.7680kHz | Crystal_SMD_3215-2pin_3.2x1.5mm | Y1 |
| 1 | 8MHZ 8MHz | OSCCC320X250 | Y2 |
| 4 | CONN_01X01 Conn_01x01 | SolderWirePad_single_SMD_5x10mm | J1, J2, J9, J10 |
| 3 | WM17068 Conn_Coaxial | SMA_Amphenol_901-144_Vertical | J3, J4, J5 |
| 1 | CONN_02X05_ODD_EVEN Conn_02x05_Odd_Even | PinHeader_2x05_P1.27mm_Vertical | J6 |
| 1 | CONN_01X03 Conn_01x03 | 70553-03 | J7 |
| 1 | CONN_01X04 Conn_01x04 | 70553-02 | J8 |
Show 26 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 12 | TestPoint | TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +4 |
| 2 | 160-1423-1 GREEN | LED_0805_2012Metric | D1, D9 |
| 2 | 160-1413-1 ORANGE | LED_0805_2012Metric | D2, D6 |
| 2 | 160-1579-1 BLUE | LED_0805_2012Metric | D3, D4 |
| 1 | 475-1415-1 RED | LED_0805_2012Metric | D5 |
| 2 | SS16T3GOS D_Schottky | D_SOD-323_HandSoldering | D7, D8 |
| 1 | 490-9706-1 FB | L_0805_2012Metric | FB1 |
| 16 | 0.1U 0.1u | C_0603_1608Metric | C1, C2, C3, C4, C5, C9, C11, C14 +8 |
| 3 | 10U 10u | C_1206_3216Metric | C6, C7, C8 |
| 5 | 22P 22p | C_0603_1608Metric | C10, C12, C13, C22, C23 |
| 1 | 10U 10u | C_0603_1608Metric | C15 |
| 2 | 0.47U 0.47u | C_0805_2012Metric | C21, C30 |
| 2 | 33N 33n | C_0805_2012Metric | C24, C32 |
| 4 | 100N 100n | C_2220_5650Metric | C26, C27, C28, C29 |
| 4 | 330u | CP_Elec_10x12.5 | C35, C36, C37, C38 |
| 4 | 2k | R_0603_1608Metric | R1, R9, R15, R27 |
| 1 | 79.6K 10k | R_0603_1608Metric | R2 |
| 1 | 10K 12k | R_0603_1608Metric | R3 |
| 1 | 330 300 | R_0603_1608Metric | R4 |
| 1 | 79.6K 1k | R_0603_1608Metric | R5 |
| 3 | 680 | R_0603_1608Metric | R6, R17, R19 |
| 11 | 10K 10k | R_0603_1608Metric | R7, R10, R11, R12, R13, R18, R21, R22 +3 |
| 1 | 0.005 | R_2512_Sense | R8 |
| 3 | 1k | R_0603_1608Metric | R14, R16, R20 |
| 1 | 120 | R_0603_1608Metric | R25 |
| 2 | 10k | R_0603_1608Metric | R28, R29 |
WPT TX design files
The KiCad project lives in the mark-belbin/simple-wireless-power repository on GitHub; these links point at the commit this page was built from.
WPT TX: common questions
What microcontroller does the WPT TX use?
The WPT TX is built around the ATSAMD21G16B-MFT, from the Microchip SAM family.
How big is the WPT TX PCB?
The WPT TX measures 100 × 45 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the WPT TX?
117 components, from 46 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the WPT TX design files?
From the mark-belbin/simple-wireless-power repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the WPT TX design in my own project?
Yes, under the terms of its GPL-3.0 license, which mark-belbin chose for the repository.
Can I test firmware for the WPT TX without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.
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