A new way to save lives by neutralizing the attacker before he can act. Story Our Vision of the Product Our vision for WISdome is a network of weapon owners, providing extended functionality for weapon maintenance and security through IoT. The product will mount weapons and connect to nearby Wi-Fi hotspots, sending information to our cloud. We […]
WISDome – Weapon Identification System Dome Continue Reading
Opening 26 pieces of windows at the same time in a 2,000-square-meter greenhouse under just 20 seconds? Yes! Story 2 years ago I decided to step to a new level in controlling micro-climate in our thermal water heated greenhouses. Before that time for example we did all airing by opening-closing windows manually. It was a
Climate Cube for Greenhouse Continue Reading
An internet-connected, easy to use PCR Thermocycler designed by high schoolers, for high schoolers. Story What is a PCR thermocycler? A PCR Thermocycler is a device that can change between desired temperatures in a controllable manner in order to properly carry out a Polymerase Chain Reaction(PCR). What is a PCR? A polymerase chain reaction is
IoT PCR: Low Cost DNA Replication Connected to the Internet. Continue Reading
In numerous RF synthesizer chips lies an inverter with input and output pins for making a reference crystal oscillator clock. I built some discrete chip inverter xtal oscillators with 74HC series logic gates to better examine them. You’ll quickly recognize the oft-used Pierce oscillator topology with 1 trimmer capacitor to tweak the fundamental frequency which
Inverter crystal oscillator Continue Reading
Actual microcontrollers have powerful bidirectional I/O ports, and you can use different techniques to fully exploit such capabilities. Recent Design Ideas described the “Charlieplexing” method as an effective way to drive M=N×(N–1) LEDs using only N bidirectional I/O ports and N resistors (reference 1 and reference 2). Unfortunately, using Charlieplexing allows you to drive only
“Chipiplexing” efficiently drives multiple LEDs using few microcontroller ports Continue Reading
During experiments with digital voice mode in hamradio I discovered a nice project describing an adapter for D-Star, DMR and other digital modes based on an Arduino Due and a little PCB to be put on top. This unit is called the Multimode Digital Voice Modem or MMDVM (see [1]). It seems that this is
Homebrew Multimode Digital Voice Modem adapter Continue Reading
If the WiFi connectivity goes down, this will reboot the router. Story There are times you are unable to connect to your WiFi router. This can be especially problematic when you have increasing number of WiFi dependent IoT devices. Many times, the remedy is to simply reboot the router i.e. unplug the power cord, wait
Keep The WiFi On Continue Reading
This SMPS can be powered with low input voltage, from 5 VDC to 15 VDC. Adjustable Output Voltage: + 92 Vdc to +340 Vdc This assembled module of the SMPS can be used as power supply, for guitar pedal booster, effects stompbox, with subminiature tubes ( CK series, 5702, 5744, 5718, 6112, 6021, 6286, …
Adjustable HV Power Supply for Stompbox Continue Reading
One of the essential elements of building IoT project is the ability to connect devices. Wi-Fi and Bluetooth are good low cost choices, but they work only at close ranges, or in hotspot areas. When the device needs to be at a remote location GSM is a good and easy to setup option. In this
Send and Receive SMS with GSM SIM900 Arduino Shield Continue Reading
Many people have created their own 3D printed version of the famous Scouter from the Dragon Ball franchise, but maker Marcin Poblocki wanted to go one step further and add a functioning screen to his prop. Before he could get to that, however, he needed to model the Scouter itself, a job he did in Fusion
Arduino adds a working screen to a Dragon Ball Scouter Continue Reading
