This is a custom made PWM dimmer addon which fits on the back of the Wireless sensor board .
The board can receive commands over uart with configurable transition speed per channel
Features:
- Onboard 500ma 3.3v power regulator to power itself and the wireless sensor board
- Support for 12v led strips
- 9 PWM channels 8 bit
Schematic
BOM
| Ref | Qnty | Value | Footprint | Vendor (LCSC) |
|---|---|---|---|---|
| C1, | 1 | 680uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C59427 |
| C2, | 1 | 120uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C251018 |
| C7, | 1 | 0.1uf | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C128353 |
| D1, | 1 | 1N5817 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | C169165 |
| J1, | 1 | RGB_VIN | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | C8269 |
| J3, | 1 | Conn_01x05_Male RIGHT | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | - |
| J4, | 1 | Conn_01x05_Male | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | - |
| J5, | 2 | RGB_strip_3 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-4_1x04_P5.00mm_Horizontal | C8269 |
| J6, | 2 | RGB_strip_1 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-4_1x04_P5.00mm_Horizontal | C8269 |
| J9, | 2 | RGB_strip_2 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-4_1x04_P5.00mm_Horizontal | C8269 |
| L1, | 1 | 100uH | Inductor_SMD:L_6.3x6.3_H3 | C10122 |
| Q1, Q2, Q3, Q4, Q5, Q6, Q10, Q11, Q12, | 9 | PMV16XNR | Package_TO_SOT_SMD:SOT-23 | C110920 |
| R1, | 1 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C103904 |
| R2, R3, R4, R5, R6, R7, R8, R9, R10, | 9 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C95781 |
| U1, | 1 | ATTINY414 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | C189365 |
| U2, | 1 | LM2594M-3.3 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | C316691 |
Render
Assembled
Issues
As vissible in the assembly, there are a few issues.
- The wrong SOT-23 footprint is used. Due this, the mosfets needs to be soldered upside down (This because pin 1 and 2 are flipped)
- The wrong pin layout for U2 is used. The trace to pad 1, 2 and 4 needs to be scratched. Pad 4 needs to be connected to D1, pad 8 to 3.3v and pad 7 to VIN.