Hi i am a final year design technology student and am in the process of designing a bicycle heart rate monitor and im looking for some help. To forfill the project i am looking for a heart rate monitor which which uses only 2 inputs on the thumbs. I have experimented with an ina114 intrementation amplifier and have used a number of different gains without sucess, does any one know of any other possible solutions, im sure it should be possible as i have ridden exercise bikes in the past with 2 thumb contacts but can not seem to find any information on them. thanks for any information.