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Do you know that fruits can produce electricity? When two different metals are placed in a common conducting solution which in this case, the juice inside the fruits, electricity will be produced. This is the basis of the electrochemical cell or wet cell. If you have a piece of fruit, a couple of copper and zinc plates, and some wire, then you can generate enough electricity to turn on an LED! Making a fruit battery is fun, safe, and easy.
Watch a video on this kit at https://youtu.be/gmtJWYzdPbk
Get this kit to keep your kids occupied with hands-on activities while enjoying the new knowledge while having fun! This DIY kit is simple enough to be built by 4 years old children, with parent's help. And children 6 years old and above can build it by themself! Let them explore electricity at a young age! You can also let your kids understand how an electrochemical cell or wet cell works. Awesome!
Note: The fruits used in this project SHOULD NOT be eaten. Care should be taken when handling the metal electrodes, LED and alligator clips.
The experiment can be conducted with various types of fruits:
Features:
- Do It Yourself wooden kit - Solar-powered fan for kids
- Simple and yet educational
- Suitable for age 4 years old and above
- Come with everything needed to assemble as a solar-powered fan.
- Powered by fruit electrolytes
- No soldering is needed
- Learn about basics of the electrochemical cell or wet cell
What's in the box?
- 3 x Copper plates
- 3 x Zinc plates
- 3 x Red alligator clips
- 3 x Black alligator clips
- 2 x Jumper wires
- 2 x Red LED
- 1 x Flat white connector
- 1 x Digital clock
Resources:
Description:
Circuit Playground Express is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and made it even better! Not only did we pack even more sensors in, we also made it even easier to program.
Start your journey with Microsoft MakeCode block-based or Javascript programming. Or, you can follow along with code.org CS Discoveries. Then, you can use the same board to try CircuitPython, with the Python interpreter running right on the Express. As you progress, you can advance to using Arduino IDE, which has full support of all the hardware down to the low level, so you can make powerful projects.
Because you can program the same board in 3 different ways - the Express has great value and re-usability. From beginners to experts, Circuit Playground Express has something for everyone.
Here's some of the great goodies baked in to each Circuit Playground Express:
- 10 x mini NeoPixels, each one can display any color
- 1 x Motion sensor (LIS3DH triple-axis accelerometer with tap detection, free-fall detection)
- 1 x Temperature sensor (thermistor)
- 1 x Light sensor (phototransistor). Can also act as a color sensor and pulse sensor.
- 1 x Sound sensor (MEMS microphone)
- 1 x Mini speaker with class D amplifier (7.5mm magnetic speaker/buzzer)
- 2 x Push buttons, labeled A and B
- 1 x Slide switch
- Infrared receiver and transmitter - can receive and transmit any remote control codes, as well as send messages between Circuit Playground Expresses. Can also act as a proximity sensor.
- 8 x alligator-clip friendly input/output pins
- Includes I2C, UART, 8 pins that can do analog inputs, multiple PWM output
- 7 pads can act as capacitive touch inputs and the 1 remaining is a true analog output
- Green "ON" LED so you know its powered
- Red "#13" LED for basic blinking
- Reset button
- ATSAMD21 ARM Cortex M0 Processor, running at 3.3V and 48MHz
- 2 MB of SPI Flash storage, used primarily with CircuitPython to store code and libraries.
- MicroUSB port for programming and debugging
- USB port can act like serial port, keyboard, mouse, joystick or MIDI!
More product details available at https://learn.adafruit.com/adafruit-circuit-playground-express
Circuit Playground Lessons available at https://learn.adafruit.com/circuit-playground-lesson-number-0/intro
These 1.8m Gold Plated HDMI to DVI-D cables are the perfect low cost solution to connecting your Raspberry Pi to your DVI monitor or TV. Broadcast quality digital video and inter-component control signals all in one compact, high-performance connection
The 1.8m HDMI to DVI-D Cable Features:
- Tested for Compatibility with the Raspberry Pi
- HDMI Male (19 Pin) to DVI-D Male (24 1 Pin)
- 1.8m Long
- 24k Gold-Plated Contacts Prevents Corrosion for Life-Long Optimum Signal-Transfer
- 30AWG Wire
- 3 Year Warranty
- Dual Link, High-Speed - 1080p Full HD
- Black PVC Jacket OD 6mm
- Triple Shielding for Maximum RFI Protection and Ultimate Picture Stability
- Supports Uncompressed Video Signals
- Perfect for both High-Definition Video and Standard Video Formats.
- Fully HDCP Compliant to Provide Highest Level of Signal Quality
- RoHS Compliant
If you want to mount your Modular Raspberry Pi Case to a TV or monitor, we have two mounts available depending on your VESA spacing requirements:
- The VESA Splash (a 4-point 75/100mm mount) (this item)
- The VESA Slice (a minimal 75/100/200mm mount)
- Four bolting points
- MIS-D 75mm & MIS-D 100mm Spacing (M4)
- Great for media & signage applications e.g. hiding a TV or monitor
- Made from laser-cut Perspex
Kit Contents
- 4 x M4 Bolts
- 4 x M4 Washers
This voltmeter work without external power supply, can use the measuring voltage directly, Wide working voltage range of 4.5-30V. The wire connection is simple, only need to connect two wires, the red line connect the anode, the black line connect the cathode.
Features:
Working voltage: 4.5-30V
Use the USB Charger Doctor to measure the working voltage and current output for any USB port and project. This plastic dongle plugs between a USB device, and passes the data lines through. There's a 0.05 ohm resistor in line with the power pin that is used to measure current draw. The Doctor's digital display instantly reads the numbers out for testing devices such as chargers, cables, and cell phones.
You can use this device from 3.5-7VDC input voltage (although most USB devices tend to hover around 4.75 to 5.25) and up to 3A of current. It displays both voltage and current readouts. It's a very handy tool for testing USB devices, checking load levels and debugging battery chargers and boost converters.
Specifications:
Voltage range: 3.3V-9V
Current range: 0-3A
Voltage display: red
Current display: blue
Out put : 2 USB
Size: 52mm x 34mm x12mm
Weight: 16g
Shell color: Dark black
What's in the box?:
1 x Voltage Tester Dual USB
Comes with an I2C breakout board at the back. This allows you to use only 2 of your controller pins to be able to communicate with your screen, leaving the rest for other things.
Specifications:
Power supply voltage: 2.5 - 6V
Supports I2C
Blue back light, contrast can be adjusted
The Raspberry Pi Camera Module comes fully assembled with a 15-Way 150mm flat, flex cable that plugs directly in the Raspberry Pi CSI port. Unfortunately the included cable is quite fragile, and can break if twisted or bent too far.
The Raspberry Pi Camera Board Replacement Cable Features:
- Direct Replacement for the Raspberry Pi Camera Board Cable
- 300mm Overall Length
- 1mm Pitch
- 15 Way Flat Cable
- Conductor: Tin plated copper
- Insulation: White PVC
- Supporting tape: Blue polyester
- UL rating: UL2896
- Temperature rating: 80°C
- Voltage: 30V
- Flame test: VW-1, FT1, FT2
- CSA Standard: CAN/CSA-22.2 No.210.2
What's in the box?:
1 x Camera Board Replacement Cable
This lovely little (14.2mm) seven segment display provides excellent segment uniformity and is highly visible up to seven meters away. It's ultra bright, and provides great readability even in bright ambient light!
It has four digits and a decimal point on each digit, designed for numeric output, so you can use it to add a clock, timer or counter into your next project.
These displays are multiplexed, common-cathode. What that means it that you can use a 74HC595 or just 8 microcontroller pins if you can spare them to control the 8 anodes (7-seg decimal) at about ~15mA each, and then connect NPN transistors or a TPIC6B595 to the cathodes to sink the 8*20mA = ~120mA maximum per digit.
This is an ultra bright RED colour.
Specifications
- 100mcd
- 14.2mm (0.56") digit height
- Color: red (630nm)
- Common cathode display
- Maximum power dissipation per segment: 66mW
- Maximum pulse peak forward current per segment (1/10th duty cycle, 0.1ms pulse width): 100mA
- Maximum forward current per segment: 20mA
- Maximum reverse voltage: 5V
- Maximum reverse current: 20µA
- Typical forward voltage: 2.1V at 20mA
- Maximum forward voltage: 2.5V at 20mA
- Operating temperature range: -30°C - 70°C
- Typical luminous intensity: 20mcd
Some code examples
https://circuitdigest.com/microcontroller-projects/raspberry-pi-7-segment-display-tutorial
https://raspi.tv/2015/how-to-drive-a-7-segment-display-directly-on-raspberry-pi-in-python
Each encoder can support one joystick. Use them to DIY your own Arcade game machine. The Zero Delay USB Arcade Encoder is a fully compatible plug and play solution, simply plug in your joystick and buttons into the encoder, plug the USB cable into the Pi, map your buttons in RetroPi and away you go - it really is that easy! You can use multiple encoders at the same time, so they're great for multiplayer arcade machines!
Joystick Size: Approx. 95x60x100mm
Encoder Board Size: Approx. 85x35mm
USB Cable Length: Approx. 1.8m
Colour: Red
We have tested this unit on Raspberry Pi using Retropie and a Windows 7 PC using MAME.
Each encoder can support one joystick. Use them to DIY your own Arcade game machine. The Zero Delay USB Arcade Encoder is a fully compatible plug and play solution, simply plug in your joystick and buttons into the encoder, plug the USB cable into the Pi, map your buttons in RetroPi and away you go - it really is that easy! You can use multiple encoders at the same time, so they're great for multiplayer arcade machines!
Joystick Size: Approx. 95x60x100mm
Encoder Board Size: Approx. 85x35mm
USB Cable Length: Approx. 1.8m
Colour: Blue
We have tested this unit on Raspberry Pi using Retropie and a Windows 7 PC using MAME.
The Raspberry Pi Camera Module comes fully assembled with a 15-Way 500mm flat, flex cable that plugs directly in the Raspberry Pi CSI port. Unfortunately the included cable is quite fragile, and can break if twisted or bent too far.
- Direct Replacement for the Raspberry Pi Camera Board Cable
- 500mm Overall Length
- 1mm Pitch
- 15 Way Flat Cable
- Conductor: Tin plated copper
- Insulation: White PVC
- Supporting tape: Blue polyester
- UL rating: UL2896
- Temperature rating: 80°C
- Voltage: 30V
- Flame test: VW-1, FT1, FT2
- CSA Standard: CAN/CSA-22.2 No.210.2
Thermoelectric coolers (TEC or Peltier) create a temperature differential on each side. One side gets hot and the other side gets cool. Therefore, they can be used to either warm something up or cool something down, depending on which side you use. You can also take advantage of a temperature differential to generate electricity.
This Peltier works very well as long as you remove the heat from the hot side. After turning on the device, the hot side will heat quickly, the cold side will cool quickly. If you do not remove the heat from the hot side (with a heat sink or other device), the Peltier will quickly reach stasis and do nothing. We recommend using an old computer CPU heatsink or other block of metal to pull heat from the hot side. We were able to use a computer power supply and CPU heatsink to make the cold side so uncomfortably cold we could not hold our finger to it.
Note: It is imperative that a heat sink is used on the hot side of the module. Running the module without one can cause damage to this part. If it’s too hot to comfortably touch, you’re in the danger zone!
Specifications:Model: TEC1-12715
Color: white
Couples: 127
Voltage: 12V
Umax: 15.4V
Imax: 15A
Max power consumption: 231W
Tmax: 70°C
Qcmax △T=0(W): 137W
Size: 40 x 40 x 3.3mm
Weight: 50g
Documents:
- Learn about TECs (Tom’s Wiki)
- Learn about thermoelectric effect (Wikipedia)
Package includes:
1 x cooler plate module(40mm x 40mm)
| Item Name | 1.4 Version High quality thin hdmi Flat cable Gold Plated Plug Male-Male HDMI Cable 1080p 3D 0.5M |
| Material | PVC / Bare Copper Conductors |
| Color | Black Or Customized |
| Cable Length | 0.5m |
| Resolution | Support Up To 1080P |
| Connector Type | HDMI |
| Connector Gender | Male - Male |
| Features | High quality. Package Includes:
|
This kind of 8 way joystick is originally used in arcade games, but we think it is a good solution for DIY projects that need multiple frequency buttons. There is 4 micro switch detects the stick position and users can easily get the stick positions by reading the voltage output from the connector with a controller such as Arduino and Raspberry Pi.
Features :
8 way operation.
Mountable in control panels.
Easy to operate with high sensitivity.
Use it to DIY your own Arcade gaming machine.
Top Ball Diameter: Approx. 35mm
Total Size: Approx. 95x60x100mm
1 x Joystick
Cables not included
Learn about RetroPie
Compatible with Zero Delay Arcade USB Encoder & Wire Set (Not included)
Compatible like buttons
Looking for easy to control LED matrix? This 4 in 1 Dot Matrix Display module should be suitable for you. The whole module comes in four 8x8 RED common cathode dot matrix that equiped with MAX7219 IC each. Great to display running text and picture. It can be cascaded to bigger dot Matrix display, but do make sure the current of 5V is sufficient to support it.
Specifications:
A single module can drive a 8x8 dot matrix common cathode
Working voltage: 5V
Module size: 12.8 x 3.2 x 1.3 cm (L*W*H)
With 64 fixing screw holes, hole diameter: 3mm
Module with input and output interfaces, support for cascading multiple modules
Wiring:
1. The left side of the module is the input port, and the right is the output port.
2. Control of a single module, the input port only need to receive CPU.
3. The more a module cascade and input end of the first module is connected with the CPU and input end of the input end of the output end is connected to the second module, output terminal of the second module connected with the three modules, and so on.
For example: 51 SCM
VCC→5V
GND→GND
DIN→P2.2
CS →P2.1
CLK→P2.0
Package includes:
1 x MAX7219 Dot Matrix Module
1 x 5pin jumper Cable
Documentation:
https://max7219.readthedocs.io/en/0.2.3/
Clock example
Python Library
The Raspberry Pi Camera Module comes fully assembled with a 15-Way 1000mm flat, flex cable that plugs directly in the Raspberry Pi CSI port. Unfortunately the included cable is quite fragile, and can break if twisted or bent too far.
- Direct Replacement for the Raspberry Pi Camera Board Cable
- 1000mm Overall Length
- 1mm Pitch
- 15 Way Flat Cable
- Conductor: Tin plated copper
- Insulation: White PVC
- Supporting tape: Blue polyester
- UL rating: UL2896
- Temperature rating: 80°C
- Voltage: 30V
- Flame test: VW-1, FT1, FT2
- CSA Standard: CAN/CSA-22.2 No.210.2
Description:
This extra long 5m Gold Plated HDMI to HDMI cables are the perfect low cost solution to connecting your Raspberry Pi to your HDMI monitor or TV. This is the latest high speed version V1.4 with Ethernet, 3D and CEC support!
The 5m HDMI to HDMI Cable Features:
- Tested for Compatibility with the Raspberry Pi
- HDMI Male (19 Pin) to HDMI Male (19 Pin)
- 5m Long
- 24k Gold-Plated Contacts Prevents Corrosion for Life-Long Optimum Signal-Transfer
- Fully CEC, Ethernet and 3D over HDMI enabled (V1.4 Connection)
- Supports 4K2K, 2160p, 1440p, 1080p, 720p and 480p Resolutions
- Supports 3D Content, Supports Audio Return Channel, Supports True HD Dolby 7.1 and DTS-HD Master Audio
- 30AWG Wire
- 3 Year Warranty
- Dimensions 22.4 x 15.2 x 2.8 cm
- Weight 206 g
Bridge cable chain is specially designed for equipment used in high speed and rapid accelerated speeds. Due to its small pitch, the two-body structure is used for easy assebly and to effectively import the bearing capacity in unsupported lengths. Especially suitable for mechanical arms, other robotics, CNC, 3D printing and general automation equipment.
General use includes protecting your cables during movement of mechanical parts and from particle interference. Also looks very neat.
- Material: Plastic Nylon
- Total length : 1M/1meter
- Color: Black
- Internal Size : 18 * 37mm (H*W)
- External Size : 23.5 * 47mm (H*W)
- Bending radius: R38
- Semi-closed, outer seal inner open cover
Give your potentiometers some curb apeal. Ideal for use with our range of potentiometers.
Specifications:
Knob top diameter : 11 mm / 0.43 inch
Knob base diameter : 14.5mm / 0.57";
Shaft insert diameter : 6 mm / 15/64"
Knob total height : 14 mm / 0.55 inch
Main color : black, white;
Weight : 12G
What's in the box?:
Quantity : 1 knob
Resources:
Python Library
Definition, Types, And Working Principle