Design with Adafruit bq25185 USB / DC / Solar Charger with 3.3V Buck Board in Cirkit DesignerThe Adafruit bq25185 USB / DC / Solar Charger with 3.3V Buck Board (Part ID: ADA6092) is a versatile and compact power management module designed for efficient charging and voltage regulation. It supports multiple power input sources, including USB, DC, and solar panels, making it ideal for portable and renewable energy projects. The integrated 3.3V buck converter ensures stable voltage output for powering low-power microcontrollers, sensors, and other electronics.
This circuit is a solar-powered battery charging and monitoring system. It uses a solar panel to charge a 3.7V battery through a buck converter and a battery charger module. The ESP32 microcontroller monitors the battery voltage and current using voltage and current sensors.
Open Project in Cirkit Designer
This circuit is designed for charging a Li-ion 18650 battery using a solar panel, with the TP4056 module managing the charging process. The XL6009 step-up buck converter boosts the voltage to power an Arduino UNO, which is programmed to perform user-defined tasks. The circuit is likely intended for solar-powered Arduino projects that require a rechargeable battery backup.
Open Project in Cirkit Designer
This circuit appears to be a solar-powered charging system with a voltage regulation stage. A solar panel charges a battery through a TP4056 charge controller, with diodes likely serving as protection against reverse current. Additionally, a 48V to 5V converter is connected to a USB connection, possibly to provide a regulated output for USB-powered devices.
Open Project in Cirkit Designer
This circuit is a battery management and power supply system that uses three 3.7V batteries connected to a 3S 10A Li-ion 18650 Charger Protection Board Module for balanced charging and protection. The system includes a TP4056 Battery Charging Protection Module for additional charging safety, a Step Up Boost Power Converter to regulate and boost the voltage, and a USB regulator to provide a stable 5V output, controlled by a push switch.
Open Project in Cirkit Designer| Parameter | Value |
|---|---|
| Input Voltage Range | 4.2V to 17V |
| Output Voltage (Buck) | 3.3V (regulated) |
| Maximum Output Current | 1A (buck converter) |
| Battery Charging Voltage | Configurable (default: 4.2V for LiPo) |
| Battery Charging Current | Configurable up to 500mA |
| Power Input Sources | USB, DC, Solar |
| Battery Type Supported | Single-cell LiPo/Li-Ion |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 25mm x 25mm |
| Pin Name | Description |
|---|---|
| VIN | Main power input (4.2V to 17V). Connect USB, DC, or solar panel here. |
| GND | Ground connection. |
| BAT | Battery connection for a single-cell LiPo/Li-Ion battery. |
| 3V3 | Regulated 3.3V output from the buck converter. |
| EN | Enable pin for the buck converter. Pull low to disable the 3.3V output. |
| STAT | Status pin for battery charging (low = charging, high = fully charged). |
| PG | Power Good indicator (high = input power is good). |
| ISET | Current set pin for configuring the charging current. |
| TS | Temperature sense pin for battery thermistor (optional). |
VIN pin. Ensure the input voltage is within the range of 4.2V to 17V.BAT pin. The module will automatically manage charging.3V3 pin to power your 3.3V devices. Ensure the total current draw does not exceed 1A.EN pin low.ISET pin to set the desired charging current. Refer to the datasheet for resistor values corresponding to specific currents.TS pin for battery temperature monitoring.PG pin to monitor the availability of input power for system diagnostics.The 3.3V output of the module can be used to power an Arduino UNO or other 3.3V-compatible devices. Below is an example of how to monitor the charging status using the STAT pin.
// Example code to monitor charging status using the STAT pin
const int statPin = 2; // STAT pin connected to digital pin 2
void setup() {
pinMode(statPin, INPUT);
Serial.begin(9600);
}
void loop() {
int chargingStatus = digitalRead(statPin);
if (chargingStatus == LOW) {
// STAT pin is LOW when charging
Serial.println("Battery is charging...");
} else {
// STAT pin is HIGH when fully charged
Serial.println("Battery is fully charged.");
}
delay(1000); // Wait for 1 second before checking again
}
Module Overheating
ISET pin.Battery Not Charging
No 3.3V Output
EN pin is pulled low or no input power.EN pin state and ensure a valid power source is connected to VIN.Solar Panel Not Providing Power
Q: Can I use this module with a 5V USB power source?
A: Yes, the module is compatible with 5V USB power sources. Ensure the input voltage is within the 4.2V to 17V range.
Q: What happens if the battery is disconnected?
A: The module will continue to provide a 3.3V output from the buck converter as long as a valid input power source is connected.
Q: Can I use this module to charge other types of batteries?
A: No, this module is specifically designed for single-cell LiPo/Li-Ion batteries. Using other battery types may result in damage or unsafe operation.
Q: How do I adjust the charging current?
A: Use a resistor on the ISET pin to configure the charging current. Refer to the datasheet for the appropriate resistor values.
This concludes the documentation for the Adafruit bq25185 USB / DC / Solar Charger with 3.3V Buck Board. For further assistance, refer to the official Adafruit resources or community forums.