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because the LED has a positive and a negative lead and will not light if they are the wrong way around and secondly
With the pre-flashed AT firmware
This driver uses Infineon chips BTS7960 composed of high-power drive full H-bridge driver module with thermal over-current protection
Can drive 4 DC motors or 2 stepper motors or 2 Servo
Hygrometer Probe Sensor Tool Set because the LED has aHygrometer Temperature Humidity Temperature range: 50 C ~ 70 C Measuring humidity range: 10% RH ~ 99% RH Humidity accuracy: 5% Moisture display resolution: 1% RH Accuracy of temperature: 1 C Operating voltage: 1. 5 V or LR44 batteries (not included) Sampling period: 10 S Dimension: approximately 48x28. 5x15. 2mm LCD dimension: approx. 40x22. 5mm Dimensions of the installation: approx. X 46x27x13. 5mm Color: Black Specifications Tutorial