The 50kg load cell is a group of half-bridge strain gauge, there are 3 ways to use it. 2.Use two sensors to form a full-bridge measurement, measuring range for the sum of the two sensors: 50kgx2 = 100kg | Use one load sensor 50kg with an external resistor to form a full-bridge measurement, the range of a sensor range: 50kg. External resistance on the higher requirements. | Use two weight sensor 50kg to form a full-bridge measurement, measuring range for the sum of the two sensors: 50kgx2 = 100kg | Use four weight scale 50kg to form a full-bridge measurement, measuring range for the sum of four sensors: 50kgx4 = 200kg | If you have any problem, please contact seller as follow: click "DIYmalls"(you can find "Sold by DIYmalls" under Buy Now button), in the new page, click "Ask a question".

The esp32 lora 915mhz comes unassembled, soldering is required, not equipped with lithium battery. | When you use esp32 oled lora, you need to use 2pcs together. One is used for receiving and another for sending | 0.96 oled is mounted on esp32 lora board via 4 screws, so it is removable but pls be careful to do it to avoid damage. | You will receive, 2pcs lora oled board 915mhz new version V3, and 2pcs 915mhz lora antenna. | The 915 lora antenna is a little big. If you want to use the lora v3 board with case, you need to buy another small lora antenna

The Keypad library allows development board to read a matrix type keypad. 4×4 numeric keypads are widely used in project which requires the user to give command to the system or to feed in some data. | You don't need the outer two pins on the left and right for wiring. It's the inner 8 pins that matter. | If you solder on a header, we highly recommend laying down some flux on the pads first, inserting the header pins, then soldering | The standard Keypad library for arduino works out of the box with this particular device. | If you have any problem, please do as follow: click "DIYmalls"(you can find "Sold by DIYmalls" under Buy Now button), in the new page, click "Ask a question".