like 5V pin is vcc/supply pin and Gnd pin is grounding so what is the significance of 3v3 pin?
You can use 3v3 pin as well, for using the LDR with a voltage divider circuit.
The 3v3 pin (5v pin as well) in bolt has a high current draw, therefore it is suggested not to use it without any resistance.
There are components and boards which require 3.3v power supply. In those case, this pin can be use used directly to power them as well.
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got it thank you for the reply
The 3v3 pin is a 3.3V volt power supply pin. Some modules and sensors work with lower voltages. When connected to a higher voltage supply, the modules/sensor chips will burn out due to over-voltage. On the other hand, certain modules require higher voltages to operate. For this purpose, the Bolt module contains two voltage supplies. The 3.3V supply works for modules that require lower voltages while the 5V works for modules that require higher voltages. There are modules that require much less voltage. This can be achieved by dividing the voltage using proper resistors. Since most modules operate on these two voltages - 3.3V and 5V, these two are provided on the board (Arduino, Bolt, Raspberry Pi).
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Lower voltage means lower power consumption.3v consumes 50% less power than 5v.So 5V draws high current hence it is recommended 3.3v
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The 3.3V pin on electronic devices, including microcontrollers and development boards, plays a crucial role in providing a stable power output at 3.3 volts. This voltage level is significant for compatibility with many electronic components, particularly integrated circuits (ICs), sensors, and modules, which often operate optimally at 3.3 volts. By offering a dedicated 3.3V pin, these devices enable direct power supply to components without the need for external voltage regulators or level shifting circuitry. Moreover, the 3.3V pin facilitates efficient interfacing and communication between different components that operate with logic levels compatible with 3.3 volts, thereby ensuring reliable operation and minimizing the risk of damage due to voltage mismatch. Additionally, the 3.3V pin contributes to reducing electromagnetic interference and noise in sensitive circuits, enhancing overall system performance and reliability. Ultimately, the availability of the 3.3V pin provides designers and developers with flexibility and convenience in designing and prototyping electronic circuits and projects.
The use of a 3.3V pin is often necessary for interfacing with components or peripherals that require a 3.3V power supply. Many sensors, displays, and communication modules operate at 3.3V logic levels. Therefore, connecting them to a 5V pin instead of a 3.3V pin could damage or malfunction these components due to overvoltage.
Bolt WIFI module has a 3.3V pin because the components provided don’t require a voltage more than 3.3V. If you are using any other electronic components then do check the voltage rating on it and only then connect it to your Bolt WIFI module.
I hope this answers your question.