I'm trying to modify a battery operated electronic toy drum for a child, who for medical reasons, can't hit the top of the drum hard enough to activate the piezo sensor fitted to it.
If I disconnect the wires to the piezo sensor, and put my meter across it, striking the drum generates a spike of 2-9v depending on how hard you do it, so I figured I might just be able to replace it with a battery and disability-friendly switch, to simulate the device. However, if I connect the sensor back up to its circuit, I see -0.6v across it, rising only slightly to -0.4v when the drum is struck. The circuit is I assume some sort of microcontroller - in reality just an unidentifiable blob.
I'm not that familiar with these sorts of devices so just wondered if anyone could tell me how it would operate and how I can rig the switch up?
Thanks!
If I disconnect the wires to the piezo sensor, and put my meter across it, striking the drum generates a spike of 2-9v depending on how hard you do it, so I figured I might just be able to replace it with a battery and disability-friendly switch, to simulate the device. However, if I connect the sensor back up to its circuit, I see -0.6v across it, rising only slightly to -0.4v when the drum is struck. The circuit is I assume some sort of microcontroller - in reality just an unidentifiable blob.
I'm not that familiar with these sorts of devices so just wondered if anyone could tell me how it would operate and how I can rig the switch up?
Thanks!