All Services Engineering & Architecture Microcontroller and audio circuit design $50/hr · Starting at $500 Microcontroller hardware design and firmware development; interfacing to sensors with I2C and SPI. Audio circuit design and signal processing. About $50/hr · Ongoing Download Resume Microcontroller hardware design and firmware development; interfacing to sensors with I2C and SPI. Audio circuit design and signal processing. Skills & Expertise CCircuit DesignDesignFirmware DevelopmentMicrocontrollerProcessing 0 Reviews This Freelancer has not received any feedback. Browse Similar Freelance Experts Firmware DevelopersMicrocontroller ProgrammersDesignersCircuit DesignersC Programmers