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funnybrum / GSMRemote

Arduino/SIM800C based GSM remote.
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Step Down Converter #1

Open paet1 opened 3 years ago

paet1 commented 3 years ago

I love this project and I am going to try that too. It will be first time, so I hope it will be successful. Concerning your code, is there a way to set a timer for automatic switch off after activation? In my case I will use a key fob and activate preheating through a combination of holding lock key for 2sec afterwards preheat button 4sec and then GSM Remote can go to sleep and close all connection. Power consumption seems promising, but would you still use a mp1584 or is there an alternative?

funnybrum commented 3 years ago

As far as I recall it - yes, there is built in timer for that. The remote was used for diesel heater. 15 minutes after the heater is powered on it gets powered off. Alternatively - if the VCC raises above certain threshold (engine is started VCC goes from 12.5 to >13.5) a 1 minute count down is activated that stops the pre-heater.

Based on the research I did the mp1584 looked like the best option back then. I was running with 7-8mA standby curren with LM2596t for a few years and zero issues related to the power battery (65Ah one). So I never switched to a better option.

paet1 commented 3 years ago

Thanks for your response Short question, mp1584 has no stepdown. So you are running sim800c with 5V? I am driving a Chevy BoltEV, so I think that VCC will be stable ;-)

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From: funnybrum notifications@github.com Sent: Wednesday, December 2, 2020 4:25:23 PM To: funnybrum/GSMRemote GSMRemote@noreply.github.com Cc: paet1 icherwerbe@yahoo.de; Author author@noreply.github.com Subject: Re: [funnybrum/GSMRemote] Step Down Converter (#1)

As far as I recall it - yes, there is built in timer for that. The remote was used for diesel heater. 15 minutes after the heater is powered on it gets powered off. Alternatively - if the VCC raises above certain threshold (engine is started VCC goes from 12.5 to >13.5) a 1 minute count down is activated that stops the pre-heater.

Based on the research I did the mp1584 looked like the best option back then. I was running with 7-8mA standby current for a few years and zero issues related to the power battery (65Ah one).

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funnybrum commented 3 years ago

The voltage should be 3.8V.

If the mp1584 module doesn't have a potentiometer you'll have to change the feedback resistors to get something close to 3.8V. And by the way - avoid potentiometers, as they are not reliable. Resistors are. I always replace the pot with a proper resistor.