The microelectronic pill is a multichannel sensor that is 16mm in diameter, 55mm long, and weighs 5 grams. It contains sensors, an application specific integrated circuit (ASIC) to connect components, and a transmitter powered by two silver oxide batteries. The pill can measure body temperature, pH, conductivity, and dissolved oxygen through its sensors. It transmits sensor data at 1 kbps for over 40 hours on its batteries while consuming only 12.1mW of power. The microelectronic pill allows for disease detection and monitoring inside the human body with low power usage and size suitable for practical applications.