Circuit Documentation
Summary of the Circuit
This circuit appears to be designed for charging a single 18650 lithium-ion battery using a TP4056 charger module and monitoring gas presence with an MQ-2 sensor. The circuit includes a buzzer for alerting purposes and is controlled by a rocker switch that powers the system on and off. The TP4056 module is responsible for safely charging the battery and providing power to the circuit when the battery is charged. The MQ-2 sensor can detect various gases and provides both analog and digital outputs. The buzzer is likely used as an indicator, possibly for gas detection or charging status. However, without a microcontroller and associated code, the functionality for triggering the buzzer based on sensor readings or charge status is not implemented in the provided design.
Component List
MQ-2 Gas Sensor
- Pins: VCC, GND, A0, D0
- Description: A gas sensor capable of detecting a wide range of gases including LPG, smoke, and alcohol. It provides both analog and digital outputs.
Buzzer
- Pins: POSITIVE, NEGATIVE
- Description: An audio signaling device that can emit a tone when powered.
TP4056 Lithium Battery Charger Module
- Pins: OUT-, B-, B+, OUT+, IN-, IN+
- Description: A module used for charging lithium-ion batteries and providing charge/discharge protection.
18650 Lithium-Ion Battery in Holder
- Pins: GND, VCC
- Description: A rechargeable battery commonly used in portable electronics.
Rocker Switch
- Pins: 1, 2
- Description: A simple on/off switch to control the power flow in the circuit.
Wiring Details
MQ-2 Gas Sensor
- VCC: Connected to the positive side of the Rocker Switch.
- GND: Connected to OUT- on the TP4056 module.
- A0: Not connected in the provided net list.
- D0: Connected to NEGATIVE on the Buzzer.
Buzzer
- POSITIVE: Connected to the positive side of the Rocker Switch.
- NEGATIVE: Connected to D0 on the MQ-2 Gas Sensor.
TP4056 Lithium Battery Charger Module
- OUT-: Connected to GND on the MQ-2 Gas Sensor.
- B-: Connected to GND on the 18650 Battery Holder.
- B+: Connected to VCC on the 18650 Battery Holder.
- OUT+: Connected to pin 1 on the Rocker Switch.
- IN-: Not connected in the provided net list.
- IN+: Not connected in the provided net list.
18650 Lithium-Ion Battery in Holder
- GND: Connected to B- on the TP4056 module.
- VCC: Connected to B+ on the TP4056 module.
Rocker Switch
- Pin 1: Connected to OUT+ on the TP4056 module.
- Pin 2: Connected to VCC on the MQ-2 Gas Sensor and POSITIVE on the Buzzer.
Documented Code
No code has been provided for any microcontrollers in the circuit. Therefore, there is no embedded code to document at this time. If a microcontroller and associated code are added to the circuit in the future, this section will be updated accordingly to include the code and its documentation.