![]() After accidentally loading a bootloader onto the Attiny2313, the timing seemed to get better. I found the timing to be a bit off so I had to empirically determine delay values in the software. Finally, I did not place a 10k resistor between pin 1 (RESET) and VCC as suggested in some minimal circuits because other sources mentioned that there was an internal pull-up resistor anyway.Īs no crystal is present, the microcontroller uses its internal RC oscillator. The simplicity of the circuit did not warrant a reset button. There is also no debouncing of the input button because there is a delay included in the software. I ignored a decoupling capacitor between VCC and GND of the Attiny2313 because I figured that the capacitors at the 7805 regulator are good enough. Then everything might actually have fit into the old music cassette case. With a little more planning I also would have placed the 100 nF capacitors somewhere else so I could have bent the 7805 regulator downwards. This line is now around the matrix and then back to reach pin 12. Had I given more thought to the circuit board layout I would have left more space between the Attiny2313 and the LED matrix to accomodate another signal line. It seems that directly driving an LED matrix with a microcontroller is not the orthodox approach but the Attiny2313 hasn't complained yet. ![]() Mechanical stabilization was realized with the indescriminate use of a hot glue gun. I also added a socket and a power switch. The power supply is via a 7805 linear regulator with two 100 nF capacitors for oscillation suppression. Pressing the button will connect the button pin to GND. ![]() PB5 (pin 9) is the input pin for the button. The pin mapping with the Kingbright TC07-11EWA 5x7 LED matrix is:Īttiny2313 port pin LED matrix pin (470 Ohm resistor) It worked by storing the character font matrix in the program memory space PROGMEM and by using direct port manipulation in combination with bitwise math operations. The particular challenge was limiting the code size in order to fit into the 2 kB of memory in the Attiny2313. A letter is selected randomly and then everybody has to say or write down a city, a country, a river, etc. Now I made a standalone version with a smaller Attiny2313 microcontroller for playing letter games with your kids such as "city-country-river" ("Stadt-Land-Fluss"). It does not store any personal data.This is a follow-up to my Instructable " Arduino random letter generator". The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. ![]() Necessary cookies are absolutely essential for the website to function properly. These passwords can be as complex as needed, with various combinations of uppercase and lowercase letters, numbers, and special characters. This tool can also be used for such a serious task as generating passwords. For example, you can play a game where you say as many words as possible that start with a certain letter, and this tool will randomly determine what that letter is for each round. These can be names of cities, countries, animals, etc. In one version of this game you look for words starting with a specific letter. A popular leisure activity for children and adults is playing word games. ![]() Since you have the option to choose uppercase or lowercase (or both), you can test your knowledge of both the uppercase and lowercase alphabet by simply generating sequentially random letters. This tool can be a great way to teach children or students the letters of the English alphabet. This tool can be very useful in a number of cases. The user simply inputs their desired parameters, such as the length of the random sequence, number of the sequences to be generated and the type of characters to include, and with the click of the ‘Calculate’ button, this tool produces sequences that adhere to these specifications. These letters can be uppercase or lowercase letters of the English alphabet, numeric or special characters (symbols), depending on the user’s preferences and needs. The Random Letter Generator is a user-friendly online tool that allows you to generate random letters. ![]()
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