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This is a great project for anybody getting into electronic equipment or desiring a concept for something trendy. This is not just a cheap project, but it’s not very expensive.
This project’s entire cost was 16.12 (~$25 at the present exchange rate), roughly the same as the brand new miniature fridge from the stores. If you don’t have a number of these components mentioned, you’ll need to purchase them.
How To Make A Mini Fridge?
Measure 1: Components and Tools Required
- Thermoelectric Cooler Module
- 4 Millimeter Acrylic Sheets
- Arduino Nano
- Relay Module
- LED Holder
- 1K Resistor
- Rocker Switch
- DC Jack
- Perforated Board
- Door Handle
- Rubber feet
- Foam Boards
- Super Glue
- Glue Sticks
- Dremel Workstation
- Dremel Rotary Tool
- Soldering Iron
- Glue Gun
Step 2: The Way It Works?
The center of the toaster is a Thermoelectric Cooler Module.
Thermoelectric coolers function from the Peltier effect. The apparatus has two ( Sexy and Cold) sides. If a DC electrical current flows through the module, it attracts warmth from 1 side to another, so that one side has got cooler while another gets warmer.
The “sexy” side is connected to a heat sink, so it stays at ambient temperatures, while the trendy side goes under room temperature.
A thermoelectric module consists of a range of de – and – n-type semiconductor components heavily doped with electric carriers.
The components are organized into an array that’s electrically connected in series but thermally linked in parallel. This variety is then affixed to 2 ceramic substrates, one on both sides of these components.
To make this Refrigerator, You’ve Got two options:
- Purchasing the Peltier module, Heat Sink, and Fans individually
- Purchasing the whole unit that has everything.
After a few inquiries, I’ve settled down to the next option. But for those who have some older SMPS lovers and CPU
The heat sink, and then you can pick the first alternative.
The first and second images are downloaded in the web for easier comprehension.
Step 3: Cutting the Acrylic Sheets
I took the dimension of routine Coke Can. Then I finalized the toaster Size. My refrigerator dimensions are
6.5″ x 11″ x 10″ (L x W x H). Thus to make a box using this dimension, we want 6 square sheets of after sizes:
- Base 11″ x 6.5.”
- Top 11″ x 6.5 “
- Left Side Wall 11″ x 10.”
- Right Side Wall 11″ x 10.”
- Front Door 6.5″ x 10.”
- Back, 6.5″ x 10.”
Note: Really front and rear cover dimensions are ( 6.5″ – 2 x Acrylic thickness) x 10″
Aside from the sheets mentioned above, we want a few additional sheets for making distinct compartments.
I utilized my Rockwell Blade Runner ( Inverted Jigsaw) to decrease the size mentioned above 4mm thick oil Sheets.
Measure 4: Cutting the Slot for Peltier Module
To correct the Thermoelectric cooler module, measure the chilly side vinyl radiator, and indicate the acrylic sheet traces.
This sheet size is exactly like the front and rear cover i.e., 6.5″ – ( 2 x depth of acrylic) x 10″.
Drill a hole within the marked area.
Add the jigsaw blade and adhere to the marked lines to cut the slot.
Step 5: Paint the Acrylic Sheets
First, peel the protective cap in the acrylic. I have translucent acrylic sheets in my inventory, but I wished to create it white. So I spray painted the sheets to produce white except the front doorway and compartments.
This measure is optional since the option of the color depends upon you. If you would like to produce like mine, then you can purchase the white acrylic sheets.
Prefer to paint the sheets out or in a well-ventilated space. Never neglect to put on the nose mask.
Step 6: Creating Holes for Air Flow
To dissipate the heat from the hot side heating of this cooler unit have two 12V fans. Since the whole unit will be held within the enclosure, we need to create a provision for airflow.
Marked the lover’s size on both sidewalls. The outline is a square shape, using a drafter compass to generate an inscribed circle. Then create holes all around.
Note: First, I attempted to create the holes using my drill using an 8mm piece, but it’s very tough and time choosing to create larger holes in oil. Therefore I used my Dremel work channel to generate the holes within the group.
Measure 7: Glue the Cooler Unit
Just take the slotted sheet and then paste the Cooler plastic radiator.
Employ sufficient glue around to create perfect sealing. This is important. Otherwise, the hot air ingress through the side.
Measure 8: Mounting the Separator
Maintain the sidewall to the dining table, as shown from the picture.
Then set the heating unit, measure its whole length. Mark a line for separation between the cold and hot sides.
Apply hot glue across the line and put the separator sheet.
To maintain the sheet perpendicular, take the support of a strong rectangular object. I utilized a 12V lead-acid battery.
Measure 9: Combine Both Side Walls
Now put the base sheet and then paste the sooner made construction.
Then glue another sidewall into the separator plate.
Step 10: Insert Supports into the Cooling Module
The heatsink together with the two lovers is really heavy. As the whole device is glued to the outside, there’s a chance of breaking the bonding. So we want some service structures to maintain the whole unit.
Cut a little size foam or thermocol sheet to produce the support.
Then insert it only under both fans.
Step 11: Get the Back Panel
We must set up the DC input Jack, one switch, and a LED for a signal from the rear panel.
To repair the LED well, you may use an LED holder as I have used.
Quantify the sizes of the components and make slots for them. I utilized a drill for producing around the slot and a simmer for the rectangular slot. Insert the components and then paste them together with the acrylic sheet.
- Solder two wires into the DC jack, red to the black and positive to the negative terminal.
- Solder a 1K resistor into the long leg of the LED ( +) then solder a red wire into the opposite end of this resistor. Solder a black cable to the LED’s short leg (-). Use a heat shrink tube to prevent shorting between the cables.
- Cut two screws (red and black) for electricity distribution to the Peltier module.
- Then stick to the image to generate the circuit.
Measure 12: Creating Deal for Sliding Tray
My thought would be to create two chilly bubbles in my fridge, one for coke cans and an alternative for chocolates. But I created the compartment in this manner so that I could keep chocolates or put them in the flat position in the upper compartment.
The lower compartment elevation is a little greater compared to normal coke can elevation ( 5.3″).
To create a sliding menu arrangement within your house refrigerator, you require some supports to maintain the tray.
Practice the steps below:
- Cut small pieces of oil, as shown in the figure. I’ve used the surplus sheet left out through the previous steps.
- Glue two strips to create it thicker if you’ve got a thicker sheet, then no need to perform it.
- Then, glue the strips into the sidewall.
- Leave some distance ( tray depth + a few margins) and paste a similar strip into the wall.
- Repeat the exact process for a different sidewall.
- Add the tray ( 3mm sheets). The size depends upon your compartment dimensions.
Note: Ensure both sides are in equal height in the foundation. Otherwise, your tray won’t stay flat.
Step 13: Create a Compartment for Electronics Circuits
I’ve split the popular side compartment into two parts. The heat sink and fans are still there in the lower portion and at the prime part, an electronics circuit to control the fridge temperature.
Follow the identical procedure as for the chilly side.
Measure 14: Insulate the Interior
To improve the heating impact, we must insulate the cold room properly. I used 5mm foam boards for insulating material.
- Measure the dimensions of this most of the wall of this chilly compartment. Then cut on the desired size foam plank.
- Use hot-glue to adhere to the oil surface.
- Apply hot glue satisfactorily in the joints for sealing.
Measure 15: Getting the Front the Door
I wished to make the front door clear so that I can observe the inside. But recall, if you’ll insulate the door beside, the cooling will probably be effective.
Mark 1cm side edge on front doorway oil protective cover. Then peel the protective paper.
Paint on the edge area. Leave it for an hour to wash it out.
Peel up the unpainted part protective cover.
Mount the hinge and manage using Super Glue. I’ve used Gorilla Super Glues.
Measure 16: Front Door Sealing
Cut a few of those 1.5cm broad foam plank sheets.
Glue the foam board strips into the doorway boundary region ( painted portion)
Then close the door and look for proper sealing and fitting.
Measure 17: Assessing the Masks
To control the temperature, I’ll utilize an Arduino to assess the cold compartment’s temperature with the support of a DS18B20 waterproof temperature sensor.
If the temperature drops below three degC, a cable will probably eliminate the source to the cooler unit. Once the temperature reaches seven degC, the cooler device will be switched ON.
This will keep the refrigerator temperature in addition to saving a great deal of power. Place the Arduino along with another circuit on the sexy side upper compartment.
I used a miniature bread for effortless connection. To join the temperature sensor into the breadboard, solder three-person headers snare. For better comprehension, refer to the above image. To insulate the joint, then use some electric tape.
Then paste the top cover.
Measure 18: Blend the Rubber Feet
As the oil sheets are slippery, I attached four anti-skid rubber feet at the bottom.
Now the refrigerator sits securely on any surface.
Measure 19: Love the Chilled Cokes
Now it’s time to power the fridge.
Connect the fridge into some 12V, 10A, or even more electricity supply. Then changed it ON, the LED should be lit up, and you’ll hear the enthusiast sound. Leave it for 10 to 15 mins. Now that the cokes and chocolates are very chilled.
Thank you for reading these Instructables. If you enjoyed it, don’t forget to discuss it.
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Video about Temperature of Peltier Mini Fridge: