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This article presents the development and efficiency evaluation of the direct current generator using energy form automobile pressure. The purposes of this study are to create a direct current generator and to evaluate efficiency of the direct current generator that can produce electricity. The mechanical structure was made of rectangular steel with the size of 1.5 x 1.5 inches, two pieces of rubber speed bump with the size of 35 x 105 x 45 cm (width x length x height), Panasonic Motor Generator Model 022P1S, crank shaft, restoring force type of spring, bearing, and leather belt. The control circuit using Arduino Pro mini is utilized coordinately with a created circuit board. The results showed that for persistence performance, after testing with the weight of vehicle, there was no effect on the mechanical structure. For power productivity performance, it was found that the produced power outputs of the front and rear wheels were averages of 1.22 and 1.59 Watts, respectively. For the battery voltage retention performance, it was found that an input voltage level was 48.86 Volts. In addition, for the performance of the display of the charging control circuit, it was found that the presentation of display had the error of 0.04 Volts of battery voltage and 0.02 Amperes of a current from the battery. These could confirm the efficiency of the created generator from the test of actual using.
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