Low voltage BLE (Bluetooth Low Energy) beacons are widely used in IoT projects, smart homes, and proximity-based applications. However, ensuring a stable power supply is crucial, especially when using coin cell batteries or low-power sources. A fluctuating or weak power supply can shorten the beacon’s range and affect its reliability.

The Problem :

BLE beacons typically operate at 1.8V to 3.6V. If the voltage drops below this range, the beacon may reset or lose connectivity. This happens when the power source, like a CR2032 coin cell, struggles to maintain voltage under load.

The Solution :

To ensure stable power, add a low dropout regulator (LDO) or a boost converter to maintain consistent voltage. For example, an AMS1117-3.3V LDO can regulate 5V from a USB source to a steady 3.3V for your beacon.

Practical Example :

Consider a BLE beacon powered by a 3.3V coin cell. If the battery voltage drops to 2.8V, the beacon may stop working. Adding a boost converter like the MT3608 module steps up the voltage to 3.3V, ensuring consistent power.

Sample Calculation :

To size a resistor for an LED in parallel with the beacon:

• Required voltage: 3.3V

• LED forward voltage: 2V

• Desired current: 20mA

R=0.02A(3.3V−2V)​=65Ω

Recommended Products :

• [AMS1117-3.3V]

• [MT3608 Boost Converter]

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