The electrical signals emitted by the human body tell us a lot about what is happening inside. But getting these signals in a microcontroller is not easy: the voltage is too small for most ADCs, and the ever-present power frequency of 50 or 60 Hz makes it difficult to discern subtle changes. In the upside-down laboratory, [Deepak Kathri] Developed a universal biosensor interface called BioAmp EXG pills Make this easier.
Its name means that it can be used in many different bioelectric sensing applications: Electrocardiogram, EMG, intraocular pressure with EEG, Processing signals from the heart, muscles, eyes, and brain, respectively. To achieve this flexibility, the board has connectors for two or three electrodes, and pads for mounting resistors and capacitors to adjust gain and bandwidth. Instrumentation amplifiers can increase the strength of the desired signal while suppressing noise and interference.
The external dimensions allow easy connection of the electrodes on one side and the data acquisition system on the other side. With a length of 25.4 mm and a width of 10 mm, it should be easy to integrate into any type of biosensing gadget you can think of. [Deepak] Several demonstration settings have been carried out to show him the use of Pill and Arduino to measure his Heart rate, Detection Wink, Even Control the robot arm Use your own arm muscles!
The EXG pill is an evolution of the early EMG-only project. We have seen several great ECG and EEG projects before, but this is the first time we have seen an amplifier can do all of these.