The problems with SIM800l & Solutions

When I visit electronics stores to buy components, I often inquire about GSM modules. The shopkeepers typically recommend the common SIM800 series module due to its affordability, but it falls short in terms of performance. In this article, I'll delve into the issues I encountered with this module, how I overcame them, and the hurdles I faced.

👀 The Current Problem 👀

Upon purchasing the SIM800 series module, I discovered that it isn't compatible with the Arduino power supply which operates at 5V and 3.3V, providing a current of 300-400mA. Unfortunately, this current range is inadequate for the module's optimal performance.

The SIM800 module requires an operating voltage of 3.4V to 4.4V approximately, and it demands a current of 2A. This higher current aids in generating the necessary frequency bursts for establishing a connection with the carrier. The module supports quad-band functionality, covering frequencies like GSM850MHz, EGSM900MHz, DCS1800MHz, and PCS1900MHz.

✌ Solution ✌

To address this issue, a constant current power supply is recommended. You can utilize a high-current cell or battery with a capacity of over 2A. Alternatively, opt for a power supply with a minimum current output of 2A. To achieve the correct voltage levels, implement a voltage divider using a resistor with a resistance value of 1 ohm or less in the R1 position. This resistor effectively limits the current.

In my case, I opted for a cell or battery solution due to the unavailability of a power supply and a 1-ohm resistor. However, even after implementing this solution, I encountered connectivity issues between the SIM800 module and the carrier.

If time is of the essence, I recommend investing in the SIM900 quad-band module. It's important to note that SIM900A and SIM900D modules should be avoided due to their dual-band limitations.