Circuit Documentation

Summary

The circuit in question appears to be a sensor-based system designed to measure environmental parameters using a DHT22 sensor, which is capable of measuring temperature and humidity. The system is powered by a 18650 Li-ion battery, which is managed by a TP4056 charging module. The Wemos D1 Mini serves as the microcontroller unit (MCU) to process the sensor data. The circuit also includes resistors that may be used for voltage division or pull-up/pull-down resistors for signal conditioning. The D1 Mini Prototype Board XD-08 ProtoBoard is used as a base for assembling the components.

Component List

DHT22

• Description: A digital temperature and humidity sensor.
• Pins: +, Out, -

18650 Li-ion Battery

• Description: A rechargeable battery providing power to the circuit.
• Pins: -, +

TP4056

• Description: A lithium battery charging module with protection.
• Pins: OUT-, B-, B+, OUT+, IN-, IN+

Wemos D1 Mini

• Description: A compact microcontroller based on the ESP8266, with built-in Wi-Fi capabilities.
• Pins: RST, A0, D0, D5, D6, D7, D8, 3V3, 5V, G, D4, D3, D2, D1, RX, TX

Resistor (100k Ohms)

• Description: A resistor with a resistance of 100k Ohms.

Resistor (27k Ohms)

• Description: A resistor with a resistance of 27k Ohms.

D1 Mini Prototype Board XD-08 ProtoBoard

• Description: A prototyping board designed for use with the Wemos D1 Mini.
• Pins: 5V, Ground, D4, D3, D2, RX, TX, 3v3, D8, D7, D6, D5, D0, A0, Reset

Wiring Details

DHT22

• + connected to 3V3 on Wemos D1 Mini and OUT+ on TP4056.
• Out connected to D4 on Wemos D1 Mini.
• - connected to G on Wemos D1 Mini and OUT- on TP4056.

18650 Li-ion Battery

• + connected to B+ on TP4056.
• - connected to B- on TP4056.

TP4056

• OUT+ connected to 3V3 on Wemos D1 Mini and + on DHT22.
• OUT- connected to G on Wemos D1 Mini, - on DHT22, and pin1 on a 100k Ohms resistor.
• B+ connected to + on 18650 Li-ion Battery and pin2 on a 27k Ohms resistor.
• B- connected to - on 18650 Li-ion Battery.

Wemos D1 Mini

• 3V3 connected to OUT+ on TP4056 and + on DHT22.
• G connected to OUT- on TP4056 and - on DHT22.
• A0 connected to pin2 on a 100k Ohms resistor and pin1 on a 27k Ohms resistor.
• D4 connected to Out on DHT22.

Resistor (100k Ohms)

• pin1 connected to OUT- on TP4056.
• pin2 connected to A0 on Wemos D1 Mini.

Resistor (27k Ohms)

• pin1 connected to A0 on Wemos D1 Mini.
• pin2 connected to B+ on TP4056.

D1 Mini Prototype Board XD-08 ProtoBoard

• Ground connected to OUT- on TP4056.
• 3v3 connected to OUT+ on TP4056.

Documented Code

No code was provided for the microcontroller. Typically, the code would be responsible for initializing the DHT22 sensor, reading data from it, and possibly transmitting the data to a remote server or displaying it locally. Without the code, we cannot document its functionality or provide any insights into the software aspects of this circuit.