Tag Archives: DIY

DIY cloud weather station with ESP32/ESP8266 (MySQL database and PHP)

via Dangerous Prototypes

A how-to on building cloud weather station with ESP32/ESP8266 @ Random Nerd Tutorials:

Build a cloud weather station dashboard to visualize your ESP32 or ESP8266 sensor readings from anywhere in the world. You’ll see your sensor data displayed on gauges and on a table. The ESP32 or ESP8266 will make an HTTP POST request to a PHP script to insert your data into a MySQL database.

See project details at randomnerdtutorials.com

Check out the video after the break.

Building an extremely high powered 1-12V lab power supply on the cheap

via Dangerous Prototypes

Matthew Millman has published a new build:

For a number of years now I’ve had a couple of high powered switching power supply units made by Power-One. They’re typically found in I.T. equipment and provide a single output rail of either 12 V or 48 V with a very high current rating. The other cool thing is that in the case of the 12 V model – the output voltage can be changed in software from 1 V to 12 V (12.45 V is the max). The 48 V model does not allow configuration of the output voltage frustratingly.

See the full project writeup on Matt’s Tech Pages.

Automatically re-connecting low-voltage cut-outs for 12 and 24 volt battery systems

via Dangerous Prototypes

KA7OEI writes:

In a previous post I described a simple circuit that provided a low-voltage cut-out that could be used in a battery-operated system – see the article “A latching low-voltage disconnect for 12 volt lead-acid and lithium batteries”. That circuit – intended mostly for lithium-based batteries – required manual intervention to “reset” the device, intended for those situations where you wanted to provide manual intervention in resetting the circuit to prevent causing harm to the battery – and maybe the gear connected to it.
This circuit is different from that described in the link above, intended mostly for lead-acid based systems where an automatic reconnect of the battery is required upon application of charge current.

More details on KA7OEI’s blog.