Tiny IOT Solution based on Arduino& SIM808 GPS/GPRS
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Integrated the power managements and storage, this GPS tracker can be an solution for some IOT projects. absolutely open with eagle design files, can modify the files as you like for your own projects.
There is also another version with Arduino Zero.(ATSAMD21G18 )
Maduino Zero SIM808 GPS Tracker v3.4.brdMaduino Zero SIM808 GPS Tracker v3.4 PCB Layoutbrd - 484.55 kB - 08/30/2019 at 09:35 |
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Maduino Zero SIM808 GPS Tracker v3.4.schMaduino Zero SIM808 GPS Tracker v3.4 CAD filesch - 438.86 kB - 08/30/2019 at 09:34 |
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SIM808 GPS Tracker v1.5.brdSIM808 GPS tracker eagle files.brd - 413.25 kB - 12/27/2017 at 04:11 |
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SIM808 GPS Tracker v1.5.schSIM808 GPS tracker eagle files.sch - 280.44 kB - 12/27/2017 at 04:11 |
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We solved the power problems , by now. ~
1. The Maduino Zero-SIM808 GPS tracker can be powered either by Lipo battery, or DC 5V, 2A. The USB is only for data communication, or programming, but not for power. Many ursers previously ask me why the USB do not power up the board, it is just their USB from PC support too small current(it need to be 2A, but most PC USB port only supply 500 mA).
2. Seperate DC-DC circuit added, using MP1584.
3. On-board charger
Besides, the Bluetooth also open and antenna added the board, to make the Maduino Zero- SIM808 GPS tracker also suppot Bluetooth + EDR
Serious problems in the testing of V3.4 version. As the testing, the max current can be upto 2.5A when SIM808 powerup.. the 3.4 DC power circuit do not bears so big transient current, that make the SIM808 do not powered up .:-(.. although this circuit works with A9G, but SIM808 needs much bigger current...
So we update again , to the version 3.5, and slves this problem ultimately.
Updates in the version 3:
1. Power circuit update: previously a 3.7v battery is needed as the A9G power supply.
in the new version 3, the module can be powered either by battery , or directly by USB.
2. Battery voltage Monitor, to check the battery voltage
3. USB voltage monitor, to check if there a USB power connected;
4. 3.3V DC-DC module updated to 1A Version
5. SIM808 DTR connected to MCU, to make SIM808 enter sleep mode
@Francesco i do not know why i do not find your comment earlier...:-(
1.) as the reset problem... indeed i have never find this problem before... and do not know if this is design, or production problem. compares to Arduino official zero design, the only differnce i can see is Arduino zero added a 330 ohm resistor serial connected.. i do not know if that is solution to solve this problem, i will need to have a try to find out the problem you mentioned in my boards firstly;
2.) as the SD socket, i select this hinge just because there no engout space for a push-pull type. need to check if the vendor quality not good enough. and the pin breakout, really a problme, need to consider to breakout the SPI pins
3. the Bluetooth now availible , with added bluetooth antenna, in the latest version V3.5.. as the audio input/output, i considered this module is mainly for IOT application and audio not used. i have to disgard these pins when there is not enough space
I bought a Maduino Zero v2.0 about a year ago and, overcoming many difficulties (mainly due to lack of documentation and support), finally I managed to build a complete GPS Tracker/Logger with many custom features.
I think that the Maduino Zero, altough a good idea, should be thorougly revised to improve first of all the reset circuitry; I say this because, when I reset the board using the pushbutton, in almost all cases the SAMD21 doesn't restart correctly; indeed it shows a random behaviour and in the majority of cases I am forced to repeat the reset many times until it restarts correctly. Also the software reset at the end of programming doesn't work correctly.
Other problems I see also in the current revision of this board (3.4) looking at its schematic diagram and layout are:
- the poor quality of the uSD-Card socket that in my case was broken just after few days of normal use. I think that the "hinge" type of socket is not adequate and a push-pull type should be better;
- the main SPI signals (MISO, MOSI, CLK) are "reserved" for the uSD-Card and not available on the I/O connectors; this is a serious problem in case one wants to connect other SPI peripherals to the board (like a display in my case).
- the bluetooth and the audio IN/OUT functionalities of the SIM808 are not available at all; they should be as in the majority of SIM808-based arduino shields
Glad to know it works OK now. Thanks for your updates about the usage
Anyone use this device, I am having issues with it that I cannot figure out. I cannot detect the serial port.
https://stackoverflow.com/questions/50360616/why-is-makerfab-sim808-atmega328-serial-port-not-showing-up-on-arduino-ide-on-my
Makerfabs
Marcus Szolkowski
Chris Hamilton
rbtsco
Excellent work here! very clean design :)
would you be open to sharing the DC-DC circuit posted above? Doesn't appear to be in the eagle files listed - thanks! :)