FLASHLIGHT
Week 01 | 09/02/2022
Battery and LED
Portable, simple, small light, easy to carry, functional — these are the goals for the flashlight project.
I listed all the absolutely necessary items: a battery, a resistor, a LED and some wires. Switch is nice to have, but not 100% needed. Figure 1 shows all the parts that the project needs, which all are taken from the shop besides the battery. The shape of the 9V battery is unique and stable, which is perfect to be the stand of the flashlight while providing long-lasting power for the LED.
figure 1 - parts
figure 2 - poke LED through the 9V connector
figure 3 - front view
figure 4 - using the gap between the connectors
figure 5 - a 220-ohm resistor is added
figure 6 - make it tidy
figure 7 - it works
figure 8 - detail
figure 9 - version II: a switch is added
figure 10 - detail
This is a fun exercise, especially for the ones who have never had any electrical experiences. As stated, the goal is to make the flashlight as simple as possible, so I personally prefer the one without the switch, which provides the “plug and go” capability.