02/15/2021 at 11:13 •
This is a simple scale that I made from recycled components:
You can see that I attached plastic containers from Ricotta cheese to three 30 cm rulers on top of a plastic bottle filled with water.
Initially I was considering submitting only a photo of my idea to the Recycled Planets Wix website. However, then I decided that this project needs a more detailed implementation description.
Step 1: Drill the Hole
Each ruler had only one hole at one end. Thus I had to drill a hole on the other end of the ruler with my Ozito electric drill.
I connected multiple rulers to metal vice and one of them did crack during drilling because I used a very thick drill bit.
Step 2: Attach Plastic Containers
I attached plastic containers with metal wire.
I used additional metal wire connections:
Step 3: Attach the Plastic Bottle
I attached a plastic bottle from Scott's hand sanitizer with Raffia Pollot ropes.
Step 4: Testing
I filled the bottle with water because I could not keep both ends of the scale equally balanced and levelled in the air:
04/05/2020 at 15:15 •
The main features of this article include:
- a high power metal wire stand,
- the propeller that I made from metal wire and masking tape to save money on a plastic propeller.
I made this product many years ago and made a few modifications recently as well as taking photos and videos:
Thus you can trust its reliability.
The fan is made from a cheap and fast 3 V DC motor.
The modifications to original design include:
- separating the two wire terminals separate to avoid a short circuit due to wire pulling,
- attaching blue tack to prevent the fan from vibrating on the table.
You can see this device working in the following YouTube videos:
03/13/2020 at 22:52 •
You can see my device working in the video:
I ordered a USB solar charger from China. It took a long time to arrive but when it came it was a kit. There were missing parts. There was no wire to attach the solar cell to the USB power supply and the rechargeable battery was missing. I figured I could use the USB power supply if I connect it to wind generator. I could not find a use for the bright LED that came with the kit.
Yesterday I found this article on https://instructables.com:
Step 1: Design the Circuit
I drawn the following circuit on PSpice student edition:
The method for calculating the maximum LED current is explained in the Instructable.
Step 2: Build the Circuit
I chosen Rv1 as only 100 ohms because my power supply is 3 volts. You cannot see it in the photo because it is behind the potentiometer. Rv2 is an 2 kohm resistor that I had for many years from an old appliance that I taken apart many years ago.
My hobby solder would not stick to PCB tracks and the holes were very small. Thus I used wire wrap wire.
i attached the circuit to foam packaging material piece with high power insulated wires and attached the potentiometer to the packaging foam piece with 2 mm metal wire bits.
You can see that in the video that the connections are not very reliable.
Probably I should have tried drilling the holes to make them wider or using solder flux to allow sticking of solder to the PCB tracks.