This paper describes the design of a portable galvanic skin response (GSR) sensor for pain sensors. GSR sensors can measure electricity change in the skin. The signal results obtained are used to collect autonomic nerve responses as a function parameter of sweat ties. This response can increase the electrical conductance or increase the resistance in the palm. GSR is a psychological change in the skin resulting from the changes in sweat gland activity; at the time, the sweat glands will be active when the body is in a state of pain. This prototype was made to measure the conductivity of the skin, and the activity based on light blows to the arms. This prototype was made to measure the conductivity of the skin, and the activity based on light blows to the arms. Measurement was delayed by 1 minute to let the body rest before receiving physical impulse. The total time taken for the measurement is 4 minutes. This prototype uses an Arduino Uno microcontroller as an analog to digital signal processor, and the results will be sent to a PC using Bluetooth HC-05 via a serial plotter for display. The purpose of this research is to develop a prototype portable GSR sensor for pain sensors in the human body. The additional value of this research is to use Bluetooth as a data transfer to make it easier to use. The results of this study succeeded in developing a prototype portable galvanic skin response with good sensor sensitivity by verifying the data using a commercial galvanic sensor module.