Does this work with a particle photon?

I found that the series 3 denuralizer’s photon emitter is phased incorrectly being effected by the relay fly back current, thus under the wave particle duality presumption the photons are not behaving in a sinusoidal manner. Try using 7v for supply voltage.

what does the jumper do?

You can remove the jumper to provide a different power supply (JD-VCC) to the relay actuation circuit from the one used by the host controller and to the LED side of the optocouplers. According to the relay spec, the nominal current draw is 71mA, and if for a 8 relay board that would be 568mA, and if you turn on all 8 relays simultaneously, you'll need 2-3 time more to achieve the latency.

Just purchased one of these. Can I hook it directly to the Raspberry Pi or do I need to use a Mosfet or Opto Isolator?

Based on the picture, this 2 relay shield already has opto isolators for both relays (that is what the two 4 pin modules are). Raspberry Pi uses 3.3V and this uses 5V, so you may want to use a level shifter (or an NPN transistor with two resistors) to keep from overloading the Pi output.

Is this a mechanical relay or an SSR? I am looking for something that will not make an audible sound when switching, and can provide very fast respons

It's a mechanical relay and makes a click, but it is not very loud. There are ssr "relays" available. Make sure to use a good heat sink if you need to switch any real current.

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SunFounder Lab 4 Relay Module 5V 4 Channels Relay Module Compatible with Arduino R3 1280 Arm PIC AVR STM32

SunFounder Lab 4 Relay Module 5V 4 Channels Relay Module Compatible with Arduino R3 1280 Arm PIC AVR STM32

Product ID: 5750864

Details

Brand
SunFounder
Connector Type
Dc Power Jack
Contact Material
Copper Gold
Current Rating
10 Amps
Mounting Type
PCB Mount

⚡10A max current

🔌4 independent relay channels

🛡️Optocoupler isolation for safety

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Description

⚡ Command your smart setup with 4x power-packed relays!

BUILT TO LAST - Robust copper-gold-silver alloy contacts ensure reliable, noise-free operation
QUAD CHANNEL CONTROL - Four relays let you automate multiple devices simultaneously
POWER UP YOUR PROJECTS - Handles up to 10A current for heavy-duty appliance control
SAFE SOUND SWITCHING - Optocoupler isolation protects your microcontroller and gear
PLUG PLAY INTEGRATION - Seamlessly compatible with Arduino R3, STM32, PIC, and AVR boards

The SunFounder Lab 4 Relay Module is a 5V, 4-channel relay board designed for seamless integration with popular microcontrollers like Arduino R3, STM32, PIC, and AVR. It supports switching currents up to 10A, features optocoupler isolation for enhanced safety, and uses durable copper-gold-silver alloy contacts for reliable performance. Ideal for DIY automation, electronics projects, and professional prototyping, this compact PCB-mount module offers robust, noise-free control of multiple high-current devices.

Specifications

ASIN	B00E0NSORY
Best Sellers Rank	#54,461 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #108 in Single Board Computers (Computers & Accessories) #854 in Industrial Electrical Controls & Indicators
Brand Name	SunFounder
Coil Resistance	15 Milliohms
Coil Voltage	5 Volts (DC)
Connector Type	Dc Power Jack
Contact Material	Copper Gold, Silver Alloy
Current Rating	10 Amps
Customer Reviews	4.6 4.6 out of 5 stars (1,293)
Item Weight	0.04 Kilograms
Manufacturer	SunFounder
Maximum Switching Current	10 Amps
Maximum Switching Voltage	5 Volts
Minimum Switching Voltage	5 Volts
Mounting Type	PCB Mount
Operation Mode	Manual
Part Number	4C-5V
Specification Met	250v 10a (Ac Rating), 30v 10a (Dc Rating)
UPC	520141421286
Unit Count	1.0 Count
Warranty Description	1 Year Guarantee
Wattage	166 Milliwatts

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