Project: Solar Dryer Temperature profiler
Concept: we are building a low cost solar dryer and wanted to study the temperature profiles during operation. for this purpose, we decided to connect to LM35 temperature sensors to the analog inputs of the arduino. We will write the captured values onto a microSD card so that we can analyze the data later.
We have also decided to make the arduino run on a 12v solar panel with a 9v battery backup. Cicruit diagram is shown below.
Would love to get your feedback and suggestions. Also, we plan to add a computer heat sink fan to the unit that can be controlled through the PWM output of the arduino. but am not sure of how to connect the fan motor to the arduino. inputs will be appreciated!