Item Tag: MottramLabs
7 posts
ESP8266 Mains Current Sensor – Wemos – Current transformer – SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: Single phase mains power sensor using a current transformer (not included) and a Wemos D1 Mini (also not included).The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay. This plugs into the sensor PCB and the ESP8266 (Wemos D1) and uses the analog input of the Wemos D1 to measure the mains current draw. The Wemos is powered by it's micro USB input. Using voltage output CT's like the SCT013 30A/1A Remove the 22R (burden) resistor as these CT's have the resistor build in. New product: A surface mount version of this board is available with a link to select between current output (100/50mA) and voltage output (100A/1V) CT's. eBay Link Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recomends Specification: ● PCB Size: 41.0mm x 32.1mm x 20mm (if Wemos D1 fitted) ● Weight: 8g (Without Wemos) ● Connections: 3.5mm Jack for CT ● LED: 3mm White LED, connected to D4 (GPIO2) Included: ⬦ PCB Assembled and Tested Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic and Demo firmware is available on Github, search for mottramlabs. Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026
4 Channel ESP32 S2 Mains Current Sensor – Wemos – Current – SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: A 4-Channel mains power sensor using a current transformer and a Wemos ESP32 S2 module (not included), the board uses the ESP32's own A/D (4 inputs). The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay, the board can use either current or voltage output types of CT (link selectable). Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recommends Specification: ● PCB Size: 56.5mm x 54.0mm ● CT Inputs: 4off 3.5mm Stereo Jacks (CT Inputs) Included: ⬦ PCB Assembled and Tested (ESP32 S2 Board (Wemos) not included) Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic is available. --> Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026
4 Channel ESP32 Mains Current Sensor – Node-MCU 30-Pin SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: A 4-Channel mains power sensor using a current transformer and a Node-MCU 30-Pin ESP32 module (not included), the board uses the ESP32's own A/D (4 inputs). The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay, the board can use either current or voltage output types of CT (link selectable). Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recommends Board Version: ESP32 Node-MCU 30 Pin Specification: ● PCB Size: 56.5mm x 54.0mm ● CT Inputs: 4off 3.5mm Stereo Jacks (CT Inputs) Included: ⬦ PCB Assembled and Tested (ESP32 Board (Node-MCU) not included) Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic is available. --> Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026
4 Channel ESP32 Mains Current Sensor – Node-MCU 30-Pin SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: A 4-Channel mains power sensor using a current transformer and a Node-MCU 30-Pin ESP32 module (not included), the board uses the ESP32's own A/D (4 inputs). The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay, the board can use either current or voltage output types of CT (link selectable). Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recommends Board Version: ESP32 Node-MCU 30 Pin Specification: ● PCB Size: 56.5mm x 54.0mm ● CT Inputs: 4off 3.5mm Stereo Jacks (CT Inputs) Included: ⬦ PCB Assembled and Tested (ESP32 Board (Node-MCU) not included) Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic is available. --> Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026
4 Channel ESP8266 Mains Current Sensor – Wemos – Current – SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: A 4-Channel mains power sensor using a current transformer and either a Wemos D1 mini or ESP-12 module (not included). The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay. This is a 4-channel version of our popular Wemos power sensor. The board uses the ESP8266 onboard A/D and uses a CD4052 multiplexer to select the channel to be measured. An onboard 3.3V regulator provides power for the ESP8266, input votage 12V DC. Version 3 boards have the addition of cut links that remove the 22R burden resistor from the circuit, this option makes using 1V type CT clamps very easy Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recommends Specification: ● PCB Size: 94mm x 41mm ● CT Inputs: 4off 3.5mm Stereo Jacks (CT Inputs) ● DC Input: 2.1mm Jack (12V DC) Included: ⬦ PCB Assembled and Tested (Wemos not included) Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic is available. --> Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026
4 Channel ESP8266 Mains Current Sensor – Wemos – Current – SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: A 4-Channel mains power sensor using a current transformer and either a Wemos D1 mini or ESP-12 module (not included). The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay. This is a 4-channel version of our popular Wemos power sensor. The board uses the ESP8266 onboard A/D and uses a CD4052 multiplexer to select the channel to be measured. An onboard 3.3V regulator provides power for the ESP8266, input votage 12V DC. Version 3 boards have the addition of cut links that remove the 22R burden resistor from the circuit, this option makes using 1V type CT clamps very easy Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recommends Specification: ● PCB Size: 94mm x 41mm ● CT Inputs: 4off 3.5mm Stereo Jacks (CT Inputs) ● DC Input: 2.1mm Jack (12V DC) Included: ⬦ PCB Assembled and Tested (Wemos not included) Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic is available. --> Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026
4 Channel ESP32 Mains Current Sensor – Wemos – Current – SCT013 – 100A/50mA
Mottramlabs.com Keeping it simple since 2018 Description: A 4-Channel mains power sensor using a current transformer and a Wemos ESP32 module (not included), the board uses the ESP32's own A/D (4 inputs). The transformer used is a "Current Transformer AC current sensor 100A SCT-013-000" available on eBay, the board can use either current or voltage output types of CT (link selectable). Warning: No direct connection should be made to any high voltage, use the Current Transformer as the manufacture recommends Specification: ● PCB Size: 56.5mm x 54.0mm ● CT Inputs: 4off 3.5mm Stereo Jacks (CT Inputs) Included: ⬦ PCB Assembled and Tested (ESP32 Board (Wemos) not included) Don't forget to look at My Other Boards Also Available: A simple 3D printable case design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic is available. --> Terms and Conditions ● The customer is responsible for all customs duties and import taxes ● Payment must be received within 4 working days of purchase, however if this is not possible, please let us know to discuss solutions. ● You will be notified on the day that your goods have been despatched via e-mail. ● Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. ● If all is well please leave feedback, so we are aware that you have received your goods. ● It is the customers responsibility to ensure that payment is received in the due time as listed above. ● All goods are sent via Royal Mail second class post. ● Goods will be despatched within 24 hrs of cleared funds, subject to the conditions listed in the payment section above. ● We accept no responsibility for goods delayed due to the services of the Royal Mail.
July 4, 2026