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Disable external module to preserve battery life

jonnyfishman 3 Dec 2014, 23:52 last edited by

Second question for the evening. I have tried several versions of the circuit below to disable an external RFID module when it is not needed (it is triggered by a button press).

The left circuit it the standard one for an RFID module but I have tried to disable it using a BC548 NPN transistor and D4 pin set to LOW when not in use (right circuit), but I can't get it to stop being powered. The LED responds as expected and turns on an off depending on D4's state but the RFID module always seems to be powered. Is this likely to be because of its other pins MISO etc, or because D4 isn't setup properly.

N.b. I have tried without the transistor and the module remains powered regardless of D4's state.

Thanks in advance,
Jon
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@NeverDie Based on my simulation and testing it's not a problem, yet I can look at it and check it's transient response.
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@NeverDie Thx for appreciating the work done. There will also be an open source part in the future. When and how extensive the open source part will be, remains to be seen. The release of certain information (block diagram, ..., in this post) is related to those open source parts. There are some OBD solutions, however most of them (in my experience) give back low frequency data put by the car manufacturer on the OBD-bus (CAN, ...). Therefore transients evolving directly from the battery could only be recorded if the manufacturer sends those data accordingly on the bus. Due to the small bandwidth(also because of other car data that have to be sent, ...), such battery data are sent more often once per second or less. Fast battery events (i.e. cranking events, ...) are therefore imperceptible. Unless the manufacturer processes the fast events and then sends them (once per second or less), which is very unlikely if the manufacturer does not market this feature itself. Third parties devices for high frequency sensing costs several hundreds dollars. In my experience, important battery states (especially the fast ones) are recorded by measuring and processing corresponding data directly on the battery. I agree with you about the limits related to the communication over Bluetooth. But i think Bluetooth 5.0 will improve a lot. However, WiFi will always remain an important option due to the high data throughput. The combination of both (BLE & WiFi), especially with regard to energy consumption, will gain in importance.
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Yes i made several reset, exclusions, inclusions, vera reset and clear EPROM but nothing worked... I made a new sensor and it works perfectly Strange... I will try again when i will have more time. Thanks for the help

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