Selecting the Solar Cell and Lithium battery You’ll learn basic to advanced Arduino programming and circuit building techniques that will prepare you to build any project. If you want to learn more about the Arduino, check out our Ultimate Guide to the Arduino video course. Use the USB connector to initially supply power to the charging circuit. Connect the circuit above using an ammeter connected to VCC measure the amount of current your circuit is using. Its operating temperature is 10☌ to 55☌ while charging temperature is 5☌ to 45☌. Lithium-Ion Batteries can be connected in parallel if both batteries are identical. Notice that the 100 uF capacitor has a polarity. Two capacitors are used to eliminate noise and smooth out the output voltage. The MCP1700 effectively regulates the voltage to the required 3.3 V for the Pro-Mini. The 03962A charge controller also allows charging from a 5-V cell phone charger (USB mini cable). At night, the charge circuit disconnects, and the battery is used as the power source for the circuit. This configuration charges the battery as well as supply power to the circuit when the solar cell is producing energy. Solar Cell, Charge Controller/Under Voltage Protection, lithium battery, and voltage regulator circuit But for this exercise, we will use the 3.3-V Pro-Mini. If you decide to use a 5V Arduino, simply add a boost converter after the 3.3V supply (Amazon Model XL6009 DC to DC converter). There is also a 5-volt Arduino Pro-Mini available that runs a 16 Mhz clock. In your design, you can use Nano if you need the extra clock speed, or possibly need to attach 5-V peripherals. Eliminating the USB controller power consumption is lowered as well as overall price and size. This omission requires you to use an FTDI controller to program the Pro-Mini, possibly adding some cost to your project. Depending on your application, this may or may not adversely affect the circuit.Īnother difference is that the Pro-Mini does not incorporate a USB host controller. This slower clock speed accounts for the most significant decrease in power needed for the Pro-Mini. Clock Speed of the Pro-MiniĪpart from the power consumption, the big difference is the clock speed of the Pro-Mini. And comparing the three, Pro-Mini is considerably smaller and less expensive. The Pro Mini with 4.7 mA brings 11 times less than an UNO. With that objective and the attributes given above, we now compare and choose between Arduino Uno, Nano, and Pro Mini.Īn Arduino Uno draws approximately 50 mA over 2 1/2 times what a Nano requires at 19 mA. The primary objective in designing a device running in solar power would be to reduce power consumption. The most significant variation is in the clock speed, power requirements, and the physical size of the boards. They have nearly the same number of analog ports, digital ports, PWM ports, and memory configuration. Microcontroller ATmega328P, 8 bit AVR family microcontrollerĪll three boards incorporate the same microcontroller.Microcontroller ATmega328P, 8-bit AVR family microcontroller.Let’s start by listing the attributes and then compare the three boards. The Arduino UNO will be our benchmark platform. Listed here are the various attributes used to determine the best suited for our example. In this exercise, we will compare the three different Arduino boards to see which one best fits your needs. Selecting the Right Arduino for Your Project *Actual values will depend on your project’s power requirements. 3.7V 18650 Lithium Ion battery (2000 mAH or more)*.
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