Libraries and tutorials for STM32F4 series MCUs by Tilen Majerle
I have about 10 matrix keypads from ebay, like this or this. They are nice, because with 8 pins I can control 16 buttons in matrix way. I made a really simple library to handle pressed button and use it in projects. Library supports long pressed button. This feature works like on PC. You can adjust refresh rate how fast this works. Everything is below. Library Features Interface with 3 x 4 or 4 x 4 matrix keypad Supports long...
Recently I made a library to read SD cards with FatFs by Chan. Today, I made a new library for USB MSC Host and connect both libraries together, so you can operate with USB flash drives and SD cards simultaneously with STM32F4xx device. USB MSC Host library is a separate library, to handle and do stuff with USB stack. You will also need my FatFS library for SD cards. I will go here step by step, how to configure this...
AM2301 or DHT21 is a digital sensor for measure temperature and humidity. It has temperature resolusion up to .1 degree and accuracy to .5 degree celcius. Humidity has .1% resolution and 3% accuracy. This is quite good. Library Features Read temperature from sensor Read humidity from sensor Dependencies CMSIS STM32F4xx STM32F4xx RCC STM32F4xx GPIO TM TM DELAY TM GPIO defines.h
In this library I’m talking about RFID (Radio-Frequency IDentification). Radio-frequency identification (RFID) is the wireless non-contact use of radio-frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information. Some tags are powered by and read at short ranges (a few meters) via magnetic fields (electromagnetic induction). Others use a local power source such as a battery, or else have no battery but collect energy from the interrogating EM field,...
It’s been some time when I post last library. Next one is internal RTC library. STM32F4xx devices have Real Time Clock (RTC) inside, with support of internal calibrated 32768 Hz oscillator or external (more accurate) 32768 Hz oscillator. RTC peripheral has also backup register support, which means that when you reset MCU, registers are not reset or if power is off and you have battery connected on Vbat pin, clock is still working. RTC can also wakeup MCU from all...
17th library is here. I will show how to basic communicate with 2 nRF24L01+ RF transceivers. The Nordic nRF24L01+ is a highly integrated, ultra low power (ULP) 2Mbps RF transceiver IC for the 2.4GHz ISM (Industrial, Scientific and Medical) band. With peak RX/TX currents lower than 14mA, a sub μA power down mode, advanced power management, and a 1.9 to 3.6V supply range, the nRF24L01+ provides a true ULP solution enabling months to years of battery life from coin cell...
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