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3

This looks like something out of an Arduino n-part “sensor kit”. It’s hard to tell because the quality of the image is not very good. My guess is, this is an analog temperature sensor, like in this link, part number 18. You can also find an example sketch there.


2

You have far too many variables and unknowns there. Primarily you need to know what the average current draw for your circuit is. Secondly you need to decide how long the solar powers are allowed to take to recharge the battery. You have to think not only about runtime but also charge time. The charge time dictates the maximum capacity of the battery, and ...


2

there are a few DIY, open source armband or watch models like : https://www.tindie.com/products/ttgo/t-wristband-diy-programmable-smart-bracelet/ which has the sources and tutorials on : https://github.com/Xinyuan-LilyGO/LilyGO-T-Wristband it's based on ESP32 and is Arduino ready.the space constraint may not allow for adding a new sensor, but it already ...


1

You need either a memory extension for your UNO - projects like Arducam did this way back 2016 and then used an OV2640 module. If you want to develop something yourself these are the steps (hurdles) to take: Get a datasheet of the camera Design a circuit including plug for Camera and a memory module (min 512Kb) Attach it to the UNO Write a library/...


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This is not a complete answer, but an idea of how to accomplish the task. I just typed it in without testing the code. Use arrays to hold variables. That way a loop can be used to service the three sensors and the three LEDs.. for (i = 0; i<3; i++) { currentTime = millis(); // ...


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The Arduino IDE gives you a massive clue Arduino: 1.8.12 (Windows 10), Board: "Arduino Uno" sketchX:2:2: error: #endif without #if #endif ^~~~~ sketchX:3:10: fatal error: ESP8266WiFi.h: No such file or directory #include <ESP8266WiFi.h> ^~~~~~~~~~~~~~~ compilation terminated. exit status 1 #endif without #if This report would ...


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