Automatic-Liquid-Dispenser
- Reference Design
・Demonstration board with RL78/G11
・The dispenser sprays a fixed amount of liquid in a single motion to minimize liquid consumption
・When a hand is placed under the nozzle, the dispenser detects the hand as a foreign object, the LED lights up and a buzzer sounds.
・The maximum operating time of the liquid dispenser is 2 seconds, even if you continue to place your hand under the nozzle
・If a hand is placed under the nozzle while the battery voltage drops below 4.8V, the LED will flash to indicate a low power condition.
・Liquid consumption per spurt: 0.5 ml / 0.8 ml (selectable)
・Translated with www.DeepL.com/Translator (free version)
This liquid dispenser reference design is for hands-free dispensing of liquids such as soap, disinfectant, shampoo, or hand lotion. Liquid dispensers are popular in public places and private institutions because they do not require contact with equipment and prevent bacterial transmission. Dispensers spurt only a fixed amount of liquid in a single motion to minimize liquid consumption. When a hand is detected near the nozzle, the MCU drives the motor for the pump, which causes the dispenser to spray the liquid. The liquid is automatically dispensed without touching any part of the nozzle, thus maintaining a more hygienic environment. When a hand comes near the nozzle, it blocks the light from the infrared LED to the phototransistor; the MCU detects the change in state of the phototransistor and drives the motor.
The solution features the RL78/G11, an internally configurable MCU with a low-pin count and analog section, and the system clock is generated by a medium-speed on-chip oscillator for low power consumption and fast 4µs wake-up.
| Manufacturer | Categories | Application |
|---|---|---|
Renesas Electronics |
Microcontrollers | Smart City/Home |
BOM Information
