![]() Who, like me, has an on/off switch, should best place this between the battery and the DC-DC converter. At pin 1 (VCC), OUT + from the LM2596 module is connected, at pin 4 (GND) comes OUT. On the right you see the structure of a USB socket (type A). We are only interested in the latter, since no data should be transmitted. Each standard USB port has 4 pins, two of which are data pins and the other two provide the voltage. The best way is with a (very fine) flat screwdriver or a (carpet) knife. By turning the small golden screw you can change the voltage until it is at ~ 5V. Now you can put the multimeter on the two OUT contacts and measure. At IN you connect the ends of the battery holder according to the polarity. The LM2596 module has IN +, IN-, and OUT +, OUT- respectively left and right. This should be around 9V (6 x 1.5V) for normal batteries and about 7.2V (6 x 1.2V) for rechargeable batteries. ![]() The values are always visible, but the module costs more.ĭepending on the batteries, Raspberry model and applications, the runtime can vary a lot (you can increase the runtime, for example by connecting two battery compartments in parallel).Īttention: Any reproduction is of course at your own risk, I can not provide any guarantee/liability!Īfter the batteries are inserted, you can already measure the voltage. If you do not have a multimeter (which is one of the standard utensils) can also take a DC-DC converter with a display. In principle, the construction with any Raspberry Pi model is possible, but should the batteries last a long time, I recommend the more economical Model A.
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