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When the soil moisture is lower than preferred setting, the relay will automatically pull in, start the sprinkler, water pump etc. until the moister reaches the desired humidity level and automatically stop.
Product use: Through the potentiometer, adjust to the desired soil moisture level

Specifications

• Electrical parameters: Supply voltage: 12VDC
• Input current: more than 100mA
• Relay Load Max: 10A 250V AC or 10A 30V DC

What's in the box?

1 x Soil moisture control module
1 x Soil sensor
2 x 20cm long DuPont lines

Resources

Module instructions

1 Module sensors applied to the detection of soil moisture,
2. Blue potentiometer is used to adjust soil moisture level, clockwise adjustment and control the humidity will be bigger, counterclockwise smaller;
3. Due to module delay function, adjust the humidity value, wait about 5-8 seconds, see if the the relay state changed, the green LED lamp will also have corresponding change, until adjusted to meet the requirements.

Specifications

Size: 62mm(L)x44mm(W)x23mm(H)
Input Voltage (Trigger): DC 3-32V
Output Voltage(Line): AC 24-380V
Output Current(Line): 50 A
On Voltage: ≤1.6V
OnOff Time: ≤10ms
Control Current: 3-35mA
Transparent Lid Included: Yes

What's in the box?

1 X 50A SSR-50DA Solid State Relay With Cover

Resources

Datasheet available at https://cdn.sparkfun.com/datasheets/Components/General/SSR40DA.pdf
Depending on how hard your relay works, you might want to add a heat sink to it.

Q:During continuity testing with my multimeter why does my relay on the AC side not switch on?
A: The below info was found at http://www.crydom.com/en/tech/newsletters/solid statements - bench test an ssr.pdf

A multimeter determines impedance by injecting a small amount of voltage through it's probes into the circuit being tested. It then measures the current flowing through the probes and calculates resistance. Easy enough; Resistance = Voltage / Current! However, as we just discussed above, a solid state relay’s output turns on by “stealing” a bit of voltage from the AC mains in order to supply current to the gate of the SCRs. Simply put, if the AC mains is not connected to the relay then the output cannot turn on. Since the voltage and current produced by a multimeter is not sufficient enough to turn on the SCRs, the output of a solid state relay will remain in the off state; even with the input signal applied. As a result, SSRs will sometimes fail an incoming inspection because the engineer expects to see a significant change in the output impedance when they turn on the relay.The most effective way to bench test a solid state relay is to construct a simple test circuit consisting of a DC power supply or battery (a 9Vdc battery will work fine in most cases ) and a 60W or 100W light bulb.

Specifications

• Breakout Board Schematic
• GitHub Repository

• 250 V
• 3A
• 10mm x 15mm
  
  

Description:

Crimps 8P8C/RJ-45,6P6C/RJ-12, and 6P4C/RJ-11 connectors

Ratcheted handle movement for added precision

Plastic-covered handles to reduce fatigue

This small size Bluetooth 4.0 TTL transceiver module allows your target device to communicate with your iPhone/iPAD, IOS 6 or Android 4.3 devices. 

Features

• Ultra-low standby power consumption 90uA~400uA 
  
• Coverage up to 60 meters 
  
• Built in PCB antenna 
  
• Power input: 3.6V-6V DC(Can not higher than 6V) 
  
• Size: 43mm x 15mm 
  
• Colour: Blue 
  
• Net Weight: 4g

What's in the box?

• Driver: SSD1306
• Interface type: IIC interface

• GND(OLED power supply)
• VCC (OLED 3.3~5V)
• SCL(OLED IIC Clock line)
• SDA(OLED IIC Cable)

• Charge voltage: DC 4.5V-5.5V(Recommend DC 5V)
• Charging current: 0-2.1A
• Charge quiescent current: 100uA
• Full charge voltage: 4.2V -1%
• Discharge current: 0-2.4A
• Discharge quiescent current:50uA
• Discharge conversion efficiency: MAX 96%
• Output voltage: 5V
• Output current: 0-2.4A
• Operating ambient temperature: -20°to 85°
• Size: 25x16x4mm
• Weight: 2.3g
• PCB board design: Immersion Gold
• Battery protection: OCP/OVP/SCP/OTP

1 x power module
1 x button

Resources

1. Charge/Discharge: All cables
2. Charge: Connect power supply and battery
3. Discharge: Connect battery and output

Single-core tinned copper wire is used, which is easy to weld and anti-oxidation, and is not easy to break. The copper wire can withstand a high temperature of 80°C, making it suitable for a variety of thermal overload applications. The single-strand copper core has strong resistance to tension and surge current, which is convenient for shaping. Packaged by reel, the copper core has a moderate diameter and clear lines, making it easy to use and store. Copper wire is suitable for welding notebooks, motherboards, LCD screens, displays and other circuit boards.

• Material: Plastic and Metal
• Total length of about 250M
• Line: 30AWG
• Single sheath outer diameter of about: 0.55mm, copper core diameter of about 0.25mm.
• Temperature: 80 degrees, single-strand copper crossing tin, have antioxidant effects.

What's in the box?

• Type: Single Sided
• Base Material: Bakelite
• Thickness: approx. 1.5mm
• Hole Pitch: approx. 2.54mm
• Hole Diameter: approx. 1.0mm
• Size: approx. 65mm x 145mm

This testing wire with alligator clips will help transmit DC current to other multi-meters or other usage.
Made from copper wire and well-made PVC.
It can pass 3-5A(max) current during your testing work.
High performance, lower resistivity and durable, fast and stable, high-speed output current

Specifications

• Colour: Red and Black (V and V-)
• Power: 5V
• Working current: 3-5A
• Lines size: 2x18AWG
• Cable Length: 332mm

What's in the box?

1 x USB Male Alligator test lead

OV7670 image sensor, small size, low operating voltage, and provides all the features of the single-chip VGA camera and image processor. Through the SCCB bus control, you can output the entire frame, sub-sampled, take the window way affect the data resolution of 8 bits. VGA image of the product is up to 30 frames / sec. Users can fully control the image quality, data format and transmission mode. The process of image processing functions including gamma curves, white balance, saturation, chroma, and so can be programmed through the SCCB interface. OmmiVision image sensor applications unique sensor technology to improve image quality by reducing or eliminating the optical or electronic defect, such as fixed pattern noise, tail-blooming, clear and stable color image.

• Low voltage suitable for embedded applications
• Standard SCCB interface compatible with I2C interface
• RawRGB to RGB (GRB4: 2:2, RGB565/555/444), YUV (4:2:2) and YCbCr (4:2:2)output format
• support VGA, CIF, and from CIF to 40x30 the size
• VarioPixel subsampling way eliminate light stripes, automatic black level calibration image quality control including color saturation, hue, gamma, sharpness ANTI_BLOOM
• ISP has eliminate noise and dead pixel compensation function
• Support image scaling
• The lens is the loss of light compensation
• 50/60Hz detection
• The saturation automatically adjust ( UV adjustment)
• edge enhancement automatically adjust
• Noise Reduction automatically adjust

• photosensitive array 640X480
• O voltage 2.5V to 3.0V ( internal LDO to core supplies ) the
• power operation 60mW/15fpsVGAYUV
• Sleep < 20 μ A
• temperature operation from 0 ° C to 50 ° C
• ( 8 -bit) output format ? YUV/YCbCr4 RGB565/555/444 GRB4: 2:2: 2:2 Raw RGB Data
• Optical size of 1/6 "
• field of view angle of 25 °
• maximum Zhen rate 30fps VGA
• Sensitivity 1.3V / (Lux-sec)
• signal to noise ratio of 46 dB
• dynamic range of 52 dB
• browsing mode progressive
• electronic exposure
• area of 3.6 μ mx 3.6 μ m
• dark current 12 mV / s at 60 ° C

The  MMDVM hotspot module new version is can work with UHF ( not VHF)
We especially provide a aluminium alloy case for you to install it.

Features

• High performance 32-bit ARM processor
• Fully assembled and tested
• Supports DMR, P-25, D-Star and System Fusion
• Onboard LEDs to show status (Tx, Rx, PTT, Mode)
• Up to 10mW RF power
• SMA antenna connector, UHF antenna included
• Mounts cleanly on all current Raspberry Pi’s including the Pi Zero
• The firmware is pre-loaded and is easily upgraded via software.
• HF 433 900 MHZ
• Support and tested with PI-STAR

What's in the box?

1 x MMDVM Hotspot Expansion Board
1 x Antenna
1 x OLED
1 X Aluminum Case

Resources

PiStar Setup guide
What is an Amateur radio Hotspot