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Disable external module to preserve battery life

jonnyfishman 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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The product listing for the step-up that the OP is using says: Sucks the juice out of your batteries. Sounds like it delivers on what it promises....
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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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@soward said: these were covered to some extent in another topic FYI: http://forum.mysensors.org/topic/479/the-new-esp8266-wifi-models
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Thnx. Any specific hints how to do that with this hardware; I will try to get this working with a few pro-mini's as relay, I might have missed this on the educational pages here, but I'm wondering how to start the network / do the roll-out. "The first time a new sensor boots up" section tells me something about that it will find it's way home (which is great, must have cost some time to get this programmed I guess), but my challenge at the moment is to find out how to get this done effectively. Should I start with the gateway and see how far I can get with a single node and replace it at that position with a repaeter node, or can I simply place some repeaters and check with a serial monitor that they contact the gateway? Thanks, Boozz
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Hi @Siddharth-Velappan The warmup time of the MH Z19b is 3 minutes. So 2 is probably fine, but you could probably do 3 just in case. Although 2 would save your more battery time. Do you mind explaining your setup a bit more? I would love to do something similar but I do not know where to get started with the PIC microcontroller!
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hello, i know it is late, but others could see it too. i had the same problem running small (LOW POWER) modules on power banks, because the battery or power bank has a built in power meter, while it is charging and consuming power, there will be power on the USB port, but the arduino's consumption is very tiny regarding charging a phone. you need to disable this feature somehow.

Disable external module to preserve battery life

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[SOLVED] High battery usage (Pro-Mini / RFM69 / Si7021)
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Disable external module to preserve battery life

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[SOLVED] High battery usage (Pro-Mini / RFM69 / Si7021) Troubleshooting • rfm69 battery pro mini si7021 battery powered • • Oumuamua

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