We will discuss the integration of a power supply for the ESP32 Board. Additionally, we will add a Boost Converter Circuit to enable the use of a 3.7V Lithium-Ion Battery for powering the ESP32. Since Lithium-Ion Batteries can discharge, we will integrate a Battery Charger Circuit along with a Battery Management System. Many Lithium-Ion/Lithium Polymer Batteries can only charge up to 4.2V, which is low for the ESP32 Board.
Therefore, we need to increase the battery voltage from 2.8V-3.7V to 5V. This necessitates the use of a compact Boost Converter Module build with inductors, ICs, and resistors. To facilitate battery charging and management, we will use the TP4056 Battery Charger Module. Alternatively, we can also power the circuit using a 9V/12V DC Adapter. The LM7805 Voltage Regulator IC restricts the voltage to 5V. If you are not going to use a battery for power, you can utilize the DC Power Adapter or a 9V Battery.
ESP32 Power Requirement
The ESP32 Board’s operating voltage is between 2.2V to 3.6V. But we can supply 5V from the Micro-USB port. For applying 3.3V there is already an LDO voltage regulator on the module to keep the voltage steady at 3.3V. ESP32 can be powered using Micro USB port and VIN pin (from external supply).
The power requirement of ESP32 is 600mA of that ESP32 pulls only 250mA during the RF transmissions. When it is performing boot or wifi operation it’s drawing more than 200mA current. Thus supplying power from Micro-USB Cable is not enough for ESP32 Board when we need to add multiple sensors or modules to the Board. This is because Computer USB port can provide less than 500mA of current. Check more on power requirements of ESP32 here ESP32 Datasheet.
Hardware Requirements
Following are the components required for making this ESP32 Power Supply project. You can get all the components from our Campus Component store.
ESP32 Board-ESP32 ESP-32S Development Board (ESP-WROOM-32)
Battery Charger Module-TP4056 5V,1A Battery Charging Module
Voltage Regulator IC-LM7805 5V IC
Female DC Power Jack-DCJ0202
Step-Up Boost Converter Module-3.7V to 5V Boost Converter Module
Switch-3 Pin SPDT Switch
Electrolytic Capacitor-470uF, 25V
Electrolytic Capacitor-100uF,16V
LED-5mm LED Any Color
Resistor-220 ohm
3.7V to 5V Step-Up Boost Converter Module
The above shown is the Step-Up DC-DC Boost converter module which provides 5V DC stable voltage output for various input ranges between 1.5V to 5V. This small tiny circuit boosts the voltage level and provides the amplified stabilized 5V output. This module operates at a frequency of 150KHZ. It utilizes varying amounts of current to generate a balanced output for different input ranges.
Read more about Boost Converter
1. Input 1-1.5V, output 5V 40- 100mA
2. Input 1.5-2V, output 5V 100-150mA
3. Input 2-3V, output 5V 150-380mA
4. Input more than 3V, output 5V 380-480mA.
TP4056 Battery Charger Module
The TP4056 module is designed specifically for charging rechargeable lithium batteries through the constant-current/constant-voltage (CC/CV) charging technique. Apart from ensuring the safe charging of lithium batteries, the TP4056 BMS Board incorporates essential protection mechanisms for lithium batteries. It is compatible with both USB power and adapter power supplies. Also because of its internal PMOSFET architecture and anti-reverse charging path, there is no need for external isolation diodes.
TP4056 Module Datasheet.
Power Supply for ESP32 with Battery Charger & Boost Converter
The circuit can be powered by using two methods, one with 9V/12V DC Adapter and other with 3.7V Lithium-Ion Battery.
To power the board through the DC Jack, we've added here a DCJ0202 Female Jack. Also we have added 470uF and 100uF Electrolytic Capacitors that serve to lower the DC fluctuations and eliminate voltage spikes. The LM7805 Voltage Regulator IC is capable of handling input voltages ranging from 7V to 35V, although it's advisable to stay within the 15V limit. Higher input voltages result in increase in heat dissipation thus we have to add a larger heat sink. Connecting the Voltage regulator's output to the Vin pin of the ESP32 and grounding it ensures the module can be powered using a 9V/12V DC Adapter or a 9V Battery.
Alternatively, if opting not to utilize a DC Adapter for ESP32 power, a 3.7V Lithium-Ion or Lithium Polymer Battery can be used. Utilizing the Boost Converter Module, the 3.7V is increased to 5V, operating within the 2.8V to 4.2V input range. The boosted 5V is connected to a switch, and the switch is linked to the 5V Vin pin of the ESP32. The Battery terminal is also connected to the output terminal of the TP4056 Battery Charger Module, allowing the battery to be charged using a 5V MicroUSB Data Cable.
Conclusion
Thus by including a Battery Charger and Boost Converter to power up the esp32, we can create a flexible and efficient power for the unique requirements of the ESP32 platform. Reach out to the Campus Component- an electronics parts suppliers today, if you are building a Battery charger, Boost converter and looking for electronic components such as ESP32 and other microcontrollers from trusted brands such as Mornsun, Espressif, AIT, IKSEMI other components.
In case you haven’t noticed yet, your iPhone battery has mediocre capacity. That’s real talk. Here’s a cheap solution: external power banks.
This may happen due to overuse or leaving the battery for too long on the charger. For example, using an impact wrench for too long can drain the battery voltage so low that the charger would fail to recognize the battery for charging. Here are a few methods of reviving lithium-ion batteries that appear completely dead.
- Using another battery:
For example, your 18V impact driver with a Makita 18V lithium-ion battery has stopped working. When you put the battery on charge, the charger renders the battery unserviceable. In this case, you can take another 18 V battery (does not matter what brand it is), and connect the batteries with the help of metal clips. Make sure the positive end is connected to positive, and the negative end is connected to the negative end. It can be dangerous if they are not connected in the proper order. Once they are connected, the voltage of the dead battery raises. You can then disconnect the batteries and connect the battery to the charger to check if it is being recognized by the charger. If the battery’s volt levels have been raised enough, the charger will recognize the battery and start charging.
- With the help of an AC adapter (for example an old phone charger):
You can fix a dead lithium-ion battery up in few minutes.
- Cut the end of an old mobile phone charger that is not in use.
- Separate the two wires and remove their cable covers. They are going to play the role of booster cables. Never mix up the positive and negative ends. The striped or solid white wire is the positive end, and the black wire is the negative end.
- Remove the screws of the battery pack.
- Open the battery case.
- Remove the two plastic pieces on the sides. They help in removing the battery from the drill when they are pressed in.
- Pull out the battery pack.
- Check the volts level with the help of a multi-meter. For example, an 18V impact wrench would have an 18V lithium-ion battery. In this case, set the multimeter on 20 volts to get the most accurate reading.
- To check the voltage levels, connect the red probe to the red terminal (positive ends) and the black probe to the black terminal (negative ends) and check the reading on the multimeter.
- Take the ac adapter/the old mobile phone charger that you used to create a booster, and touch the black wire to the negative terminal and the white or stripped wire to the positive terminal. Keep doing this on and off for about a minute.
- Check the voltage of the battery with the help of the multi-meter. The boosting process would have raised the voltage levels.
- Put the battery pack inside the battery case and secure the plastic and the screws.
- Connect the battery to the charger to check if it is getting charged now.
One most important point to remember if you own a power tool that runs on the lithium-ion battery is that never completely discharge the battery. A completely drained lithium-ion battery cannot be recharged by the charger.
The battery and charger are companions that go hand in hand and provide each other support.
The modern charger is frequently made by an outsider and incorporates exceptional highlights, for example, charging at unfriendly temperatures.
Even though batteries work underneath freezing, not everything sciences can be charged when cold and most Li-particles fall into this classification.
A rest condition can happen while putting away the battery in a released state where self-release carries the voltage to the cut-off point.
A customary charger treats such a battery as unserviceable and the pack is regularly disposed of.
Lift applies a little charge current to raise the voltage to between 2.2V/cell and 2.9V/cell to actuate the security circuit, so, all in all, an ordinary charge starts.
