Next wire the positive terminals of the battery to the positive both the buck and boost converters in parallel. Next, we will connect our DC TO DC voltage Regulators to our battery.įirst, ensure that the switch placed on the battery as shown before is off before wiring to prevent component damage during calibration. This project can also be done in various ways, like doing the project such that only the display will be battery-powered, in which case all you will have to do is follow the guide, and disregard the steps for the set up of the raspberry pi.Īlso, this project can be used to power a phone or any other USB powered device instead of a raspberry pi board, if you disregard all the parts of each step dealing with the monitor or any variations of such, hence knowing the basics taught here is instrumental to any further improvements or modifications. The DC to DC Voltage converters being used in the project are:1) a boost converter, this will increase our 7-volt input, to a steady 12-volt output for use by our monitor and 2) a buck converter, this will decrease our 7-volt input to a steady 5-volt output with an ample supply of current for the most intense of operation. Hence leading to our 2S battery configuration is ideal for the task at hand (due to there output being around 7V) as it is close enough to the nominal voltage of the raspberry pi to also provide ample load current and close enough to the nominal voltage of the screen such that when the voltage is increased, there will be enough current to still operate the screen. As the raspberry pi requires a larger load current than out display, the Voltage will have to be reduced to meet the raspberry pi's required voltage and load current minimum Due to the battery's output not being initially satisfactory to power the project efficiently on its own, DC to DC Voltage converters are required to convert the output voltage of our battery to that of the required voltage of each device (leading to an alteration of the batteries maximum output load current also), either by raising or lowering the voltage(hence lowering and raising the current respectively). Now, let us go over our power regulation system. As such the battery can output an average voltage of 7 volts and its current output and capacity being determined by the number of cell groups being used. Lithium-ion cells (on average having a capacity of 3.5 V), are being used to power this project, in a 2S configuration (The cells are ordered in cell groups of which contain two cells wired in series, which each cell group being wired in parallel to each other). We chose a 12-volt monitor for this project, and a raspberry pi operates at a voltage of 5 volts and requiring up to 3 amps to maintain power depending on which raspberry pi board is used. Here is a quick run-through on the theory and principles behind the project, as it is important to understand the basic electronic principles behind this project.įirstly let's assess the core components we chose. 18650 battery cells in even quantities ( Excersize extreme caution when buying lithium-ion cells from vendors who you are unfamiliar with buying from ) (Optional) A 3d Printer to print mounting parts and battery case if needed Single-core small and medium electronics Wire of which can handle at least a maximum of 10 amps A DC TO DC buck converter with USB output: An LCD 12 VOLT rated monitor (I used a 7-inch screen) A Raspberry pi (any board will work, just note the volage requirement and current draw for later reference) and necessary adapters and power cords :
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