https://github.com/46nori/picolight

'Rotating Beacon Light' device controlled by Raspberry Pi Pico W.
https://github.com/46nori/picolight

kicad raspberry-pi-pico

Last synced: 5 days ago
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'Rotating Beacon Light' device controlled by Raspberry Pi Pico W.

• Host: GitHub
• URL: https://github.com/46nori/picolight
• Owner: 46nori
• License: mit
• Created: 2024-04-15T13:20:34.000Z (7 months ago)
• Default Branch: main
• Last Pushed: 2024-04-17T14:18:17.000Z (7 months ago)
• Last Synced: 2024-08-07T06:32:06.401Z (3 months ago)
• Topics: kicad, raspberry-pi-pico
• Homepage:
• Size: 136 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# PicoLight

日本語のREADMEは[こちら](./README_ja.md)

**PicoLight** is a 'Rotating Beacon Light' device controlled by Raspberry Pi Pico W. I created it as per my daughter's request :-).

![Light-On](https://github.com/46nori/PicoLight/assets/6856913/0143ed51-ab86-4af1-ac7c-fdcd258776c4)

## Specifications

- Controller

  - Raspberry Pi Pico W. Power supply is 3.3V.

- Rotating Beacon Light

  - Connected to GPIO22 (output).

  - Controlled by N-ch MOS FET.

- Push button switch

  - Connected to GPIO8 (input).

  - Set GPIO pin configuration to pull-up (INPUT_PULLUP).

- LED

  - Connected to GPIO2 (output).

  - Current limiting resistor is adjusted according to brightness.

## Schematic diagram

PDF is [here](./KiCad/PicoLight.pdf)

![](./KiCad/PicoLight.svg)

- D1 (LED) : Active Low

- LA1 (Rotating Beacon Light) : Active High

- SW1 (Push button switch) : Active Low

## MOS FET　selection

### Rated Specifications of Rotating Beacon

- ASS-12 Product Specifications

  - [Schneider Electric Japan Holdings Ltd.](https://www.proface.com/ja/product/signaling/beacon/ass)

  - [Akizuki Denshi Tsusho](https://akizukidenshi.com/goodsaffix/ass-12.pdf)

- Rated Voltage: 12V

- Power Consumption: 5W

- Surge Current: 4A

- Hence, the steady-state driving current is assumed to be $I_D=0.42A$.

### Required MOS FET Performance

- For driving the rotating beacon, the maximum ratings should meet the following criteria:

  - Drain-to-Source Voltage: $V_{DSS} > 12V$

  - Drain Current: $DC > 4A$

- The MOS FET's gate threshold voltage should be: $V_{th} < 2.5V$.

  - The H-level voltage of CMOS output: $Supply Voltage - 0.8V$

  - Since the GPIO supply voltage of Raspberry Pi Pico W is $3.3V$, the CMOS GPIO's H-level voltage is $3.3-0.8=2.5V(min)$.

### 2SK2232

- [Data sheet](https://toshiba.semicon-storage.com/info/2SK2232_datasheet_ja_20090929.pdf?did=13451&prodName=2SK2232)

- Maximum rating: $V_{DSS} = 60V$ ($> 12V$, no problem)

- Maximum rating: $DC = 25A$ ($> 4A$, no problem)

Gate threshold voltage: $V_{th} = 2.0V (max)$ ($< 2.5V$, no problem)

- Allowable power loss: $P_D = 35W$

  - Drain-to-Source On-Resistance $R_{DS(ON)} = 0.08\Omega (max)$

  - $P_D = {I_D}^2 \times R_{DS(ON)} = 0.42^2 \times 0.08 = 0.01W$ ($< 35W$, no problem)

- Since the switching speed with GPIO is slow, the input capacitance (1000pF) would be okay.

## Power Supply

- The output voltage of the AC adapter is 12V. Choose an AC adapter with sufficient current capacity since the surge current of ASS-12 is 4A.  

  e.g.: [Akizuki Denshi Tsusho's 12V 4.17A Switching AC Adapter](https://akizukidenshi.com/download/ds/litone/lte50es.pdf)

- The power supply 3.3V for Raspberry Pi Pico W is generated from a three-terminal regulator (TA48M033F).