Felini - Revolutionary Pocket-Sized Electronic Lab

The new hardware version utilizes the RK816 PMIC IC, adding IR control for learning commands and controlling devices.
It also incorporates a dedicated Si5351 for PWM signal generation and a Max98357 to enable Fenilni to produce audio like a phone, eliminating the buzzer with beep tones, making everything truly audio-oriented. 

The new casing version also allows for a doubling of the battery capacity, increasing it from 150mAh to 300mAh.

PMIC on Felini uses axp173 to support power path, battery charging, energy management, energy measurement, voltage control.
However, the power sequence on the AXP is written OTP once on the chip at the factory, this makes it difficult for some friends who try to rebuild the felini but buy the wrong axp173 chip, this can be fixed with a few tips fishing line. However, after days of searching for a replacement IC, I found a better candidate, the RK816, with a resistor-configurable output DCDC, no matter what version the RK816 is, once powered on, The esp32 will automatically configure the default voltage to the correct voltage required by felini

New hardware will be updated soon, after I recover from exhaustion from preparing for the hackaday prize

Intuitive user interface inspired by the windows phone interface on LUMIA phones. The small boxes of the interface allow users to interact easily despite the relatively small screen. Supports gestures such as swipe left, swipe right, swipe up, and down.

Now, you can see the entire project resources here Hardware | Firmware Don't forget to give me a GitHub star if you find it useful ^^ .

I forgot a few ideas, and some things will take more time to perfect. That is the ability to flash offline firmware for AVR/Arduino, ESP... Infrared command learning interface, expansion breadboard... I will complete these in the near future. Of course, it wasn't in time to submit for the Hackaday prize.

The short video to submit for Hackaday Prize 2023 has been updated by me, you can watch it here.

ESP32 features a peripheral called pcnt - pulse counter, which allows counting pulses on any GPIO pin, combined with a timer. We can entirely count the number of pulses over time to calculate the frequency. And here is how I use it to measure the frequency with Felini.

I have an interesting picture, Felini is debugging for its sibling, Felini hardware v1.4. The new version has a small error on the axp192 pmic ic, I mistakenly bought the axp192 version without 3.3v output at dcdc1, so I need a little trick :v

I have just completed 2 Felini boards with minor hardware modifications. By adding the TPS63811 power IC, Felini can provide customizable output voltage at the power pin within the range of 2.2-5.2V. The new design also incorporates a logic level shifting IC, in conjunction with the TPS63811, enabling Felini to easily communicate with different logic levels such as 2.8, 3.3, 4.2, and 5VDC without the need for shift level circuits.

Felini has a compact screen and comes with an encoder button on the side that allows users to tweak parameters easily. Therefore, a user-friendly and easy-to-operate display interface is necessary. And such an interface has appeared. It's Lumia, thanks Mr Felix Biego for the Lumia UI.