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[ESP32] Modified circuit with power supply noise countermeasures to avoid surface mounting errors.

The MAX98357 itself needs to be connected to pins 25, 26 and 22 of the ESP32 WROOM 32E. keep the I2S signals (BCLK, LRCLK and DIN) as close as possible to pins 25 and 26 of the ESP32, as keeping the wires short reduces the risk of signal degradation and cross-talk. Attempt to optimise decoupling capacitors in the circuitry around the power supply to reduce power supply noise.

built-in(C++)Development/Designelectronic circuitEntrepreneurMia

[ESP32] Investigation of the cause of cracked speaker sound and no playback due to wiring error (magnifying glass and oscilloscope)

When the IC package of the Class D amplifier was changed from TQFN to WLP, 4 out of 25 were defective in the speaker area as follows. Investigate the cause of sound crackling and audio not being played back. Verify if the sound crackling is resolved by first lowering the volume in the application. Next, using a magnifying glass, visually check for wiring defects.

built-in(C++)Development/Designelectronic circuitEntrepreneurMia

[Stock issue] What if a part is out of stock when I place my order? Using JLCPCB’s pre-order.

In order to deal with out-of-stock issues like this one when they decide to order, JLCPCB allows pre-ordering, which means that the parts can be ordered before the PCB assembly is ordered and kept in stock at JLCPCB until the PCBA service is required. These pre-ordered parts are sent together with the PCB (and surface mount if you have also asked for surface mount), rather than separately from the PCB and only the parts are sent to you.

Development/Designelectronic circuitEntrepreneurMia

[Mia] How to set up an interactive user experience on your website.

'Wouldn't it be possible to set up a 3D model of Mia on the HP and offer an interactive user experience on the HP as well, with a 360-degree rotation for viewing, and eyes that move and talk when you nod your head?'　I came up with the idea.The part of Mia's head to be touched was made into an orange sphere (like a mandarin orange) to clearly indicate the part to be touched. The switching gif image and audio file were uploaded to the media and made a URL reference.

EntrepreneurMia

[EEG] From the Conception to the Closing of an Earphone-type EEG Measurement Device

An earphone-type EEG device that measures brain waves only through the ear, and visualises brain waves on an app via Bluetooth connection. It was successful in measuring brain waves called alpha waves, which occur during relaxation, such as when dozing or meditating. It could be used as a BCI application for voice assistant activation by blinking, stress detection, automatic hearing threshold detection, etc.

2023.01.23 2024.08.01

[Mia Shipping] Trying to optimize box size and shipping costs.

Until now, we have been dealing with intangible software products such as SaaS and apps, so we did not have to worry about delivery and packaging, but this is our first tangible product, so we have to think about packaging size and shipping costs. Trial and error with Yamato's web pick-up service and Japan Post.

EntrepreneurMia

[Mia] What I learned from customer support via X (formerly Twitter)

Yesterday, I was looking at X in Mia and the following X post caught my eye! We need to deal with this as soon as possible (sweat)".Although we were able to resolve the error, which in itself was good, the customer response, including the inadequate email forwarding settings, left us with issues to address.So, we decided to implement the following two solutions. - Set up a Google form in the app for bug and error enquiries - Set up a Mia community.

2024.07.31 2024.08.01

EntrepreneurMia

[SNS Marketing] How to Create FB and Insta Ad Reel Videos and Verify A/B Testing

This article describes how to create reel-to-reel video ads and how to distribute ads. In my case, I have a policy of "first running a small test with a daily budget of ¥1,000 for a week" for SNS advertising, so I started with a daily budget of ¥1,000 for this time as well.When I first conducted a trial transmission with a budget of ¥1,000 for the following video, the CTR (cost per advertisement until website click) was about ¥30 at first, but it was gradually optimised afterwards, and finally dropped to nearly ¥10 after about three days.

EntrepreneurMarketingMiaSNS

Procedure and Points to Note when Doing the Procedures for Increasing Capital by Yourself

The other day, after a long time, I prepared the documents for the capital increase procedure by myself and submitted them to the Legal Department, and as expected? I found a flaw and the Legal Affairs Bureau called me and asked me to correct it (they were very polite), so I am writing this down as a reminder. The paperwork is not that difficult and a simple capital increase can be done in 30 minutes, so it is better to do it quickly by yourself and even if there are corrections, just follow the instructions of the person in charge.

Flixy “Medication IoT Calendar” Failure Review Part1

Although it is a bit late, I would like to look back on the flixy "Medication Calendar", which I developed as my first major project as a student, before the MELP web interview. The resolution of the target users was low, the user needs were not captured, and the means and purpose of winning the contest were reversed.

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