The engineering model of OBC/OBDH for UGM-SAT was designed to control data handling program and to interface the satellite subsystems to OBC/OBDH. The OBC/OBDH?s based on the Microchip microcontroller PIC16F877A with 20 Mhz clock speed. The system?s equipped with four external 24LC512 EEPROM?s with a storage capacity of 256 kB. The external memories?re used to store housekeeping information. The system?s equipped with a ACS712ELCTR-05B-T current sensor, voltage sensor and LM335Z temperature sensor. The accuracy of the measurements?re more than 99%. The system?s also equipped with IC Real Time Clock (RTC) DS3232M with an internal clock of 32.768 Hz, which?s used to synchronize the time between OBC/OBDH with other subsystems. The components of OBC/OBDH was chosen with industrial standards, small packages and low power. OBC/OBDH?s designed to operate in environments with extreme temperature conditions. The communication with other subsystems was designed to use I2C-bus. Protocol data for communication between the satellite subsystems have been designed. A Hamming Code(8,4) algorithm has been implemented to protect housekeeping information from being corrupted due to radiation. Error detection and correction speed is 1.800 byte/s. The engineering model of OBC/OBDH for UGM-SAT have met the standard specifications, and ready for further testing hardware and software

Kata Kunci : OBC/OBDH; Hamming Code(8,4) algorithm; error detection and correction; I2C