I've just ordered these modules for a project I'm thinking of giving to some of my IoT students. SIM900 GSM shield - development board for Arduino [SIM900] SIM800L GSM GPRS module [SIM800L] I would appreciate hearing from anyone who has practical experience of using these devices. I've watched…

Looking forward to hearing how it goes, and if you get it to work whether you would share your code. I managed to get my SIM800L small development board working this week with a Wemos D1 Mini using Arduino code. Got SMS send and receive as well as sending URLencoded data to a remote PHP page. [SI…

Just a quick update on progress with my SIM900 GSM module connected to a Wemos D1 Mini. [sim900] I recently discovered the TinyGSM library (which has been a huge help to me)... [image] GitHub - vshymanskyy/TinyGSM: A small Arduino library for GSM modules, that... A small Arduino libr…

Breadboard now fitted with a BME280 and an LED. [sim900_bme280_led] As you can see, I am now getting real readings (in my Node-RED flow). [real_readings] I can also send a MQTT command to toggle the blue LED. This is routed via BeeBotte and is acted upon by the SIM900 which is subscribed to a …

Things have moved on at quite a good pace. I found a GPS module in my resources box so I had a go at coupling it to the Wemos and sending Lat & Lon values to Node-RED via the GSM/SIM900. [GPS_wemos] That all worked out well so I thought... "um - I'll put it in the car and give it a test run". Fir…

Here's a screenshot of my NR dashboard that interacts with my MySQL database. [tracker_D] The horizontal slider along the bottom-edge of the screen selects and filters out the day of the month, while the vertical slider selects a timeframe for the day. These settings are for 19th Nov at 09:00hrs …

Thanks Dave for the suggestion - by 500m do my mean... you take the lat & lon values and add/subtract a percentage or a small number to see what size movement there has been?

No I mean 500 metres. Or some distance you choose to drop markers. You can use flat earth approximation to make the maths easier.

[image] dceejay: flat earth You are going to get on troubled, LOL, the flat earth's are going to catch you. Sometimes to simplify something is better, just calculate in you area what 500m are equivalent in degrees.

Yeah - sorry what I meant is you don't have to use the more complex haversine especially if using an esp chip... I usually use 110540m per degree - for latitude, and 110540/cos(lat) for longitude then simple pythagorous. (and can set cos(lat) to a constant if you aren't going to go far …

SIM900 and SIM800L GSM project

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dceejay 19 November 2022 16:29 33

The way I have done it before is to just compare the current position with the last sent and if greater than (say) 500m then send. If not don’t. ( or maybe then send if time diff is greater than say 5 mins).

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SIM900 and SIM800L GSM project

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