IoT

Thu
15
Sep
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ESP8266 based wireless NTP server No internet connection needed

Wireless NTP server based on ESP8266 and GPS

INTERNET CONNECTED DEVICES AND TIME SYNCHRONIZATION

A lot of devices that are connected to the internet uses NTP protocol to synchronize internal clocks in a periodic way. Personal computers (PC) are the most common case. Those devices usually have an internal clock (RTC), but probably lost a second or more every day. After some days the offset could be from some minutes to hours.

* Este articulo tambien esta disponible en Español haciendo clic aqui

With the near omnipresence of the internet, a lot of connected devices, to lower manufacturing costs, don't include an RTC, so every time a timestamp is needed a call to an NTP server is made.

Wed
30
Dec
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Internet Of Things (IoT) Using NiceRf LoRa1276

Picture of NiceRF LoRa1276 wireless module

LPWAN and LORA

Internet of things (IoT) has evolved in such way that every day is cheaper, smaller and less power hungry to communicate "things" that were impossible a few years ago. Now technologies like GSM and WiFi are the most used for that task, but has their disadvantages:

GSM, 3G, LTE: High costs: A data plan is needed for communications, high energy consumption

WiFi, BLUETOOTH : Low distance coverage ( tens of meters inside buildings)
high energy consumption!

* Este articulo tambien esta disponible en Español haciendo clic aqui

To overcome the disadvantages of previous technologies, LPWAN ( Low Power Wide Area Network ) has been proposed, and must fill some requirements:

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