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Welcome to the ESP32 CYD PDA wiki!

Apps

• Calculator - simple calculator
• Files - file browser
• Notes - text notes
• Contacts - contacts
• Todo - notes with checkboxes
• Expenses - expenses
• Books - read books
• Draw - draw and save images (format BMP, 240x288)
• Schedule - plans for specific dates
• System Info - system info
• Torch - control built-in LED
• Wi-Fi - connect Wi-Fi, check connection status
• Dashboard - clock, weather, currency rates
• Fuzzy Clock - text clock
• Gopher Browser - see https://ru.wikipedia.org/wiki/Gopher for details
• Chat - simple chat
• Weather - weather
• Counter - count clicks
• Random Numbers - random numbers
• Timer - set timer, auto-repeat
• Stopwatch - stopwatch
• Breathe - breathing timer
• Screen Test - test LCD screen
• Screensaver - simple screensaver
• Security - set owner info and password
• Brightness - set brightness level
• Calibration - calibrate touchscreen
• Fifteen - fifteen puzzle game
• Lights Off - lights out puzzle game
• Life - cellurar automaton Life
• I2C Scanner - scan I2C devices with

Filesystem

• /Settings - settings folder
• /Settings/Calibration - calibration data
• /Settings/Password - password (for password)
• /Settings/Owner - owner info (for password)
• /Settings/Coordinates - geo coordinates (for weather)
• /Settings/Timezone - timezone (for clock)
• /Settings/Brightness - brightness level
• /Settings/Nickname - chat nickname
• /Settings/Timestamp - current timestamp
• /Settings/Autostart - autorun app after startup (not used yet)
• /Settings/Gopher - gopher browsing history (not used yet)
• /Settings/Hidden - hidden apps (not used yet)
• /Settings/Home - gopher home page (not used yet)
• /Settings/Rotation - screen rotation (not used yet)
• /Notes - notes
• /Books - books
• /Todo - todo
• /Expenses - expenses
• /Images - images
• /Contacts - contacts
• /Schedule - schedule
• /Cards - cards (not used yet)
• /Downloads - downloads (not used yet)

Touch sensor calibration

It uses three-dots linear calibration.

You touch three specific dots (should not be on one line).

Then it solves two systems of linear equations:

Ax * xt1 + Bx * yt1 + Cx = xs1
Ax * xt2 + Bx * yt2 + Cx = xs2
Ax * xt3 + Bx * yt3 + Cx = xs3

Ay * xt1 + By * yt1 + Cy = ys1
Ay * xt2 + By * yt2 + Cy = ys2
Ay * xt3 + By * yt3 + Cy = ys3

Ax, Bx, Cx, Ay, By, Cy - correction factors
(xt1, yt1), (xt2, yt2), (xt3, yt3) - touchscreen points
(xs1, ys1), (xs2, ys2), (xs3, ys3) - screen points

It could fix parallelogram distortions.