Thanks for the information and links.
Yes this is for a car computer and adding the app to the bundle.
The internal 30 amp sensor is of no real use as of now, no need to measure low current useage. Using a shunt would be the option but not the best choice. Best option would be a change in hardware. Trying to measure low voltage signal changes in the mv range in an already high voltage noise area is a feat best left for those that like to beat their head on a wall. It requires tight filtering first follow by an op amp circuit to broaden the range of measurement. If you amplify this signal without the filtering you will decrease signal to noise ratio. Also using a shunt, in an environment where you are trying to conserve energy. is a big waste of energy. Energy given off as heat from the resistance.
Best option and one I have contacted the manufacturer about is to modify the analog section of the shunt section. I have located some 12 volt dc powered hall effect current sensors that the wiring can simple pass thru. These are available in ranges +- 100 amps to +- 600 amps. Analog output is 2.5 volts +- 2.0 volts with 2.5 volts= 0 amps. At this voltage level the filter does not have to be as critical and no amplification is required to raise the level or expand the range.
Hopefully with these changes it would lower the component count, add accuracy, and ease user installation. I don't think there would be much change in cost. The device may lower in cost, the price of the hall effect sensor is more expensive than a shunt. So total cost would be a wash.
For now it is just wait and see what their reply is. I will play with sniffing on some BT devices I have here now to prepare myself for later. I have done serial data in the past when the data protocol was unknown.
P.S. Don't sniff someone else's ear buds. Ear wax is not a pleasant smell.
Yes this is for a car computer and adding the app to the bundle.
The internal 30 amp sensor is of no real use as of now, no need to measure low current useage. Using a shunt would be the option but not the best choice. Best option would be a change in hardware. Trying to measure low voltage signal changes in the mv range in an already high voltage noise area is a feat best left for those that like to beat their head on a wall. It requires tight filtering first follow by an op amp circuit to broaden the range of measurement. If you amplify this signal without the filtering you will decrease signal to noise ratio. Also using a shunt, in an environment where you are trying to conserve energy. is a big waste of energy. Energy given off as heat from the resistance.
Best option and one I have contacted the manufacturer about is to modify the analog section of the shunt section. I have located some 12 volt dc powered hall effect current sensors that the wiring can simple pass thru. These are available in ranges +- 100 amps to +- 600 amps. Analog output is 2.5 volts +- 2.0 volts with 2.5 volts= 0 amps. At this voltage level the filter does not have to be as critical and no amplification is required to raise the level or expand the range.
Hopefully with these changes it would lower the component count, add accuracy, and ease user installation. I don't think there would be much change in cost. The device may lower in cost, the price of the hall effect sensor is more expensive than a shunt. So total cost would be a wash.
For now it is just wait and see what their reply is. I will play with sniffing on some BT devices I have here now to prepare myself for later. I have done serial data in the past when the data protocol was unknown.
P.S. Don't sniff someone else's ear buds. Ear wax is not a pleasant smell.
