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Parallax 27115 Single Relay Board
The Parallax 27115 Single Relay Board is a compact microcontroller-compatible relay module designed for switching high-current DC loads up to 10 amperes using low-voltage control signals. Professional engineers, roboticists, and automation technicians use this board extensively in home automation systems, industrial control applications, and embedded projects requiring reliable electromechanical switching. This product solves the critical problem of interfacing low-power microcontroller outputs with high-current devices by providing galvanic isolation and robust switching capabilities without additional circuitry.
Product Overview
The Parallax 27115 Single Relay Board operates on the principle of electromagnetic relay switching, where a low-voltage control signal energizes a relay coil that mechanically closes or opens high-current contacts. The board features a SPDT (Single Pole Double Throw) relay configuration, allowing users to switch between normally-open and normally-closed states. The design incorporates a protective diode across the relay coil to suppress back-EMF transients, ensuring stable operation and protecting sensitive microcontroller pins from voltage spikes during relay de-energization.
What distinguishes the Parallax 27115 is its integration of a high-gain transistor driver circuit that requires minimal control current, making it compatible with direct microcontroller pin outputs from platforms like Parallax Propeller, Arduino, and PIC microcontrollers. The board operates at 5V logic levels with relay coil voltage of 5V DC, delivering switching capability for loads up to 10A at 125V AC or 28V DC. The compact form factor and through-hole component layout make it ideal for breadboard prototyping, while the screw terminals provide secure connections for both control and load circuits.
Key Specifications
| Specification | Details |
| Product Type | Single Channel Relay Control Module |
| Brand | Parallax Inc. |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Control Voltage | 5V DC logic compatible |
| Relay Type | SPDT (Single Pole Double Throw) |
| Maximum Switching Current | 10A at 125V AC or 28V DC |
| Relay Coil Voltage | 5V DC |
| Control Input Current | Approximately 50mA |
| Dimensions | Compact breadboard-compatible form factor |
Key Features
- High-gain transistor driver circuit requires minimal control current, enabling direct microcontroller pin operation without additional amplification stages
- SPDT relay configuration provides flexible switching options with normally-open and normally-closed contact states for diverse application requirements
- Built-in protective diode suppresses back-EMF transients during relay coil de-energization, protecting sensitive microcontroller pins from voltage spikes
- 5V logic-level compatible control interface works seamlessly with Parallax Propeller, Arduino, PIC, and other standard microcontroller platforms
- Screw terminal connectors ensure secure and reliable connections for both control signals and high-current load circuits
- Breadboard-compatible layout allows rapid prototyping without requiring PCB design or soldering
Applications and Use Cases
- Home automation systems for controlling high-current AC appliances like fans, lights, and pumps using low-voltage microcontroller logic
- Industrial control and monitoring applications requiring reliable switching of motor loads, solenoids, and electromagnetic actuators
- Robotics projects needing precise control of DC motor direction and speed through relay-based switching configurations
- Security and alarm systems for triggering high-current warning devices, sirens, and notification systems from microcontroller-based detection circuits
- Greenhouse and agricultural automation for controlling irrigation pumps, ventilation fans, and heating elements based on sensor inputs
- Laboratory instrumentation and test equipment requiring programmable control of power distribution to various high-current subsystems
How to Use
To implement the Parallax 27115 Single Relay Board, connect your microcontroller output pin to the control input terminal with appropriate current-limiting logic. The board requires a 5V power supply connected to the positive and negative rails. Configure your microcontroller pin as a digital output and set it HIGH to energize the relay coil, which closes the relay contacts and allows current to flow through your load circuit. Connect your load device between the common terminal and either the normally-open or normally-closed terminal depending on your desired switching behavior.
For AC load switching, connect the AC source to one of the relay contacts and the AC load to the common terminal, ensuring proper voltage ratings are not exceeded. When switching inductive loads such as motors or solenoids, verify that the relay contacts can handle the inrush current, which may exceed the steady-state current rating. Always include appropriate fuses or circuit breakers in the load circuit for safety. The board's protective diode prevents relay coil damage, but ensure your microcontroller pin is rated for the control current draw of approximately 50mA.
Frequently Asked Questions
Can the Parallax 27115 relay board control AC loads directly?
Yes, the relay contacts are rated for 125V AC at 10A maximum, making it suitable for directly controlling AC appliances, lights, and motors. However, ensure proper isolation between the low-voltage control circuit and the AC load circuit for safety. Always use appropriate circuit protection such as fuses or circuit breakers on the AC side.
What is the maximum switching frequency of this relay board?
Electromechanical relays have mechanical limitations on switching speed, typically rated for approximately 10-20 switches per second under full load conditions. For higher frequency switching applications, consider using solid-state relays or MOSFETs instead. Exceeding the mechanical switching frequency reduces relay lifespan significantly.
Do I need a separate power supply for the relay board?
The relay board requires 5V DC power on its power rails. If your microcontroller already provides 5V power, you can share this supply if the total current draw does not exceed your power supply's capacity. The relay coil draws approximately 100mA when energized, plus the microcontroller's current requirements. For systems with multiple relays or high-current loads, use a dedicated 5V power supply rated for at least 500mA.
Is the relay board compatible with Arduino and Raspberry Pi?
The Parallax 27115 is fully compatible with Arduino boards as it operates at 5V logic levels. However, Raspberry Pi GPIO pins operate at 3.3V logic levels, requiring a level-shifting circuit or dedicated relay driver module designed for 3.3V operation. For Raspberry Pi projects, we recommend using a 3.3V-compatible relay module instead.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Parallax 27115 Single Relay Board Online in India
Purchase the Parallax 27115 Single Relay Board online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Parallax 27115 Single Relay Board with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.
Parallax 27115 Single Relay Board
The Parallax 27115 Single Relay Board is a compact microcontroller-compatible relay module designed for switching high-current DC loads up to 10 amperes using low-voltage control signals. Professional engineers, roboticists, and automation technicians use this board extensively in home automation systems, industrial control applications, and embedded projects requiring reliable electromechanical switching. This product solves the critical problem of interfacing low-power microcontroller outputs with high-current devices by providing galvanic isolation and robust switching capabilities without additional circuitry.
Product Overview
The Parallax 27115 Single Relay Board operates on the principle of electromagnetic relay switching, where a low-voltage control signal energizes a relay coil that mechanically closes or opens high-current contacts. The board features a SPDT (Single Pole Double Throw) relay configuration, allowing users to switch between normally-open and normally-closed states. The design incorporates a protective diode across the relay coil to suppress back-EMF transients, ensuring stable operation and protecting sensitive microcontroller pins from voltage spikes during relay de-energization.
What distinguishes the Parallax 27115 is its integration of a high-gain transistor driver circuit that requires minimal control current, making it compatible with direct microcontroller pin outputs from platforms like Parallax Propeller, Arduino, and PIC microcontrollers. The board operates at 5V logic levels with relay coil voltage of 5V DC, delivering switching capability for loads up to 10A at 125V AC or 28V DC. The compact form factor and through-hole component layout make it ideal for breadboard prototyping, while the screw terminals provide secure connections for both control and load circuits.
Key Specifications
| Specification | Details |
| Product Type | Single Channel Relay Control Module |
| Brand | Parallax Inc. |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Control Voltage | 5V DC logic compatible |
| Relay Type | SPDT (Single Pole Double Throw) |
| Maximum Switching Current | 10A at 125V AC or 28V DC |
| Relay Coil Voltage | 5V DC |
| Control Input Current | Approximately 50mA |
| Dimensions | Compact breadboard-compatible form factor |
Key Features
- High-gain transistor driver circuit requires minimal control current, enabling direct microcontroller pin operation without additional amplification stages
- SPDT relay configuration provides flexible switching options with normally-open and normally-closed contact states for diverse application requirements
- Built-in protective diode suppresses back-EMF transients during relay coil de-energization, protecting sensitive microcontroller pins from voltage spikes
- 5V logic-level compatible control interface works seamlessly with Parallax Propeller, Arduino, PIC, and other standard microcontroller platforms
- Screw terminal connectors ensure secure and reliable connections for both control signals and high-current load circuits
- Breadboard-compatible layout allows rapid prototyping without requiring PCB design or soldering
Applications and Use Cases
- Home automation systems for controlling high-current AC appliances like fans, lights, and pumps using low-voltage microcontroller logic
- Industrial control and monitoring applications requiring reliable switching of motor loads, solenoids, and electromagnetic actuators
- Robotics projects needing precise control of DC motor direction and speed through relay-based switching configurations
- Security and alarm systems for triggering high-current warning devices, sirens, and notification systems from microcontroller-based detection circuits
- Greenhouse and agricultural automation for controlling irrigation pumps, ventilation fans, and heating elements based on sensor inputs
- Laboratory instrumentation and test equipment requiring programmable control of power distribution to various high-current subsystems
How to Use
To implement the Parallax 27115 Single Relay Board, connect your microcontroller output pin to the control input terminal with appropriate current-limiting logic. The board requires a 5V power supply connected to the positive and negative rails. Configure your microcontroller pin as a digital output and set it HIGH to energize the relay coil, which closes the relay contacts and allows current to flow through your load circuit. Connect your load device between the common terminal and either the normally-open or normally-closed terminal depending on your desired switching behavior.
For AC load switching, connect the AC source to one of the relay contacts and the AC load to the common terminal, ensuring proper voltage ratings are not exceeded. When switching inductive loads such as motors or solenoids, verify that the relay contacts can handle the inrush current, which may exceed the steady-state current rating. Always include appropriate fuses or circuit breakers in the load circuit for safety. The board's protective diode prevents relay coil damage, but ensure your microcontroller pin is rated for the control current draw of approximately 50mA.
Frequently Asked Questions
Can the Parallax 27115 relay board control AC loads directly?
Yes, the relay contacts are rated for 125V AC at 10A maximum, making it suitable for directly controlling AC appliances, lights, and motors. However, ensure proper isolation between the low-voltage control circuit and the AC load circuit for safety. Always use appropriate circuit protection such as fuses or circuit breakers on the AC side.
What is the maximum switching frequency of this relay board?
Electromechanical relays have mechanical limitations on switching speed, typically rated for approximately 10-20 switches per second under full load conditions. For higher frequency switching applications, consider using solid-state relays or MOSFETs instead. Exceeding the mechanical switching frequency reduces relay lifespan significantly.
Do I need a separate power supply for the relay board?
The relay board requires 5V DC power on its power rails. If your microcontroller already provides 5V power, you can share this supply if the total current draw does not exceed your power supply's capacity. The relay coil draws approximately 100mA when energized, plus the microcontroller's current requirements. For systems with multiple relays or high-current loads, use a dedicated 5V power supply rated for at least 500mA.
Is the relay board compatible with Arduino and Raspberry Pi?
The Parallax 27115 is fully compatible with Arduino boards as it operates at 5V logic levels. However, Raspberry Pi GPIO pins operate at 3.3V logic levels, requiring a level-shifting circuit or dedicated relay driver module designed for 3.3V operation. For Raspberry Pi projects, we recommend using a 3.3V-compatible relay module instead.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Parallax 27115 Single Relay Board Online in India
Purchase the Parallax 27115 Single Relay Board online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Parallax 27115 Single Relay Board with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.