so, because here is so much feedback/and website-views on this ES9028Q2M i thought i write something about it again.. after thinking about programming this STM 8S103F3 MCU on the board (and see some Arduino IDE tuturials to become a LED blinking par example->https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino—v32/experiment-1-blinking-an-led , super nice a MUST to watch !! 😉 ) and examining the layout i see that there are also these „Vol+“,“Vol-„, „Delay“ (means filter-settings (FIRs) i think) and the „DSD“ + „PCM“ holes for Diodes/LEDs..
so i think u need only an LED (i would say Blue for DSD and Red for PCM) and a 220 Ohm-Resistor->
to make this LEDs „shine“ 😉 also with such Buttons (here i had measurements about 1cm*0,7cm (100mm*70mm)) it must be possible to have a HW-Volume and Filter-Control.. but u have to solder it right 😉 ..
another possibility would also be to solder some 4 Male 2.54mm Pin Header on it, and connect it then to a STM32F103C8T6 by example to control it via this (and with a bluetooth-receiver-transmitter and bluetooth-app par example..) still thinking about; greets for the moment 😉
okay, bought some STM32F103C8T6 („Blue Pill“) of about 1,55€ (1,72$) !! at Aliexpress->Link thought i could use it for my planned own DIY-DAC to display input-source, samplerate, filter-settings, volume etc..
also a 2.6 “ TFT (240X320)->Link (Youtube-Vid is with an 0.96 OLED)
you can program/flash it with a Raspberry Pi->Link, no need for a usb-ttl adapter or ST-Link or something..
so, and with this Arduino IDE u can write some little programms/“sketches“ and write/upload them directly to the chip.. now i must a find a way to read out some information (from maybe a XMOS-USB-Bridge) about the samplerate for example, or maybe which input (USB (I2S), opt, coax) and write it out on a display.. but super no clue at present !! 😉 , i´ll inform you here about some progress..
hi there, just read here:-> „it seems that there is already an MCU fitted (ST’s STM 8S103F3) programmed to allow access to some of the es9028 internal hardware functions (volume etc)…“ ->LINK (additional link->LINK)
guess on the „newer“ ES9028Q2M´s (layout „2017 04 09“) there is this STM 8S103F3 and there is also a 4 pin header (5V+, SWIM,GND, Reset) to program/read out them..(SWIM-interface)
so, now is the question if someone has ever read out that eeprom (on these boards) or re-programed (and with what ?).. any comments here concerning this topic are really,really appreciated !!
(Attention: cable colors not matching perfectly->just for illustration !!)
Features: Breadboard power supply module, compatible with 5V, 3.3V, apply to MB102 breadboard. Two road independent control, can switch over to 0V, 3.3V, 5V. On-board two groups of 3.3V, 5V DC output pin, convenient for external lead use.
Specifications: Input voltage: 6.5-12V (DC) or USB power supply Output voltage: 3.3V / 5V (switchable) Maximum output current: < 700mA Dimension: Approx. 5.3cm x 3.5cm / 2.1″ x 1.4″
10 Pieces ->5,19€ (incl.shipping) !! on ebay-> LINK
wonderful for external (USB-Powering) 5V Hifi-components, such as the ES9023 Board above or par example these things-> (and you can use 2-3 or more components powered by this breadboard power supply !!) okay,
and second such an „I2S“-Doubler; also absolut wonderful and can also be powered via this Breadboard/5V !!
(Remark: unfortunately not tested here; the breadboard power supply just arrived but havent found the right male-male usb-cable yet, so i have to wait, but i would (will) have had soo much fun with it, i guess 😉 )