This project aims to provide the instructions for building a touch-sensitive multi-picture frame. When the user touches one of the pictures, the frame will play one of several soundfiles, stored on a sd-card.
This project uses the ESP32s touch-capability together with a picture frame, prepared with aluminum-foil to detect a touch.
- For each picture, a set of sound-files can be played that will be cycled through at each touch
- Easy change of soundfiles by exchange the soundfiles from the sd-card
- Possibility of having more than one set of soundfiles, the set of soundfiles can be changed by a button-press
- Relatively low power consumption, depending on the Voltage-Regulator, a standby-current less than 100 uA can be achieved
- For calibrating the touch-sensors, the real-time values can be monitored via UART.
While the code will work reliable. There are some minor issues that I do not like, for example that there is no central config-file. Also, there is a mixture of non-consistent c and c++ style as at first, I wanted to stick with c, but quickly missed features of c++. I consider this project as archived, thus are not planning to improve/clean the rest.
Possible improvements:
- Make a clean PCB
- Use a P-MOSFET for disconnecting the SD-Card from power instead of the N-MOSFET solution
- Improve wake-up speed from deep-sleep. At startup, all soundfiles are first loaded which leads to a noticeable lack
- Make the choice of the soundfile set permanent, at the moment it is reset after a power loss.
- Code cleaning, central config file and rewrite parts of code to fit in the class based pattern
- Implement battery-check
- clone
- Adapt touchThreshold and pins in touch_esp.cpp
- use platform-IO to download the dependencies and build it, use an FTDI to program it
- place 16-bit (ideally mono) WAV-SoundFiles on an SD-Card:
- need to be formatted as FAT32
- The wave-Files need to be placed in a subfolder of: /frame/sound/YOURNAME
- The filenames must not exceed 50 characters
- The filenames need to end with .wav
- The filenames need to start with
- a two-digit number starting at 00 that tells to which picture they belong, e.g. all files starting with 00 belong to the first picture 01 to the second picture. Example: 00_FirstSoundForFirstImage.wav 00_SecondSoundForFirstImage.wav ... 01_FirstSoundForSecondImage.wav ...
Used components:
- a picture frame, I used the IKEA Ribba
- aluminum-foil to form the electrodes
- ESP-WROOM-32 together with ESP-32S Adapter Board
- a SD-Card slot
- Voltage Regulator LDL1117S33R (but the AP2114H-3.3 would result in a lower sleep-current)
- Max98357 for sound output together with an AIYIMA 45MM speaker
- battery holder for three AA-batteries
- pinheaders, ect.
