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hardware (esp. computer)

[Mia] Want PR but not enough inventory? Reality of tightrope walking encountered in hardware

We have made a major update to Mia's functionality and we want to do a big PR campaign, but we have been plagued by a shortage problem and we have been keenly aware of the need for stock control and the psychological difficulty of PR, so we have described the stock problem. On reflection, ‘we should have moved on to the next order in a situation where we had plenty of stock’.

EntrepreneurMia

[MAX98357A] Changed IC package of class D amplifier from TQFN to WLP

The MAX98357A series of ClassD audio amplifiers is available in TQFN and WLP packages. The WLP package is smaller and more cost-effective than the conventional TQFN package, as it does not require expensive through-hole vias (connection pins that pass through the PCB).

2023.12.28 2024.08.21

Development/Designelectronic circuit

[Speaker] I attended the workshop on acrylic speaker amplifiers. I learned a lot.

I decided to start a speaker business for the hearing impaired in January this year, so this workshop came at the right time when I wanted to deepen my understanding around speakers.

2023.01.28 2024.08.01

Development/Designelectronic circuit

[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

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.

[ESP32] Electronic circuit of the self-made board that can also be driven by LiPo battery

Describes the process of creating a home-made ESP32 board that can support both USB Type-C and LiPo batteries. The charging current is regulated by PROG and the voltage regulator is switched from AMS1117 to ME6211 series; an automatic switching circuit is implemented using PMOSFETs.

2023.12.16 2024.06.19

Development/Design

[Mia] Ships WooCommerce orders via Yamato with web pickup request.

Thankfully, 12 orders came in on the first day, so we're getting ready for delivery straight away: we're creating an online shop function by integrating Stripe payments with WooCommerce, an open-source e-commerce platform for WordPress.

[Mia] I actually assembled 18 of them, and I didn’t expect half of them to work!

This time, I will also fix the production firmware write version and actually assemble it. At this point, I'll power it up with a USB TypeC power supply and see if it actually works. Well, everything should work! I thought, but I didn't expect it to work nearly half the time!"

Development/Design

[Mia] Simulate every step of the packing process.

ちなみに最初の100台の組み立てに関しては、手作業で自分達で行うことにした。コストカットと、自分達が全工程を把握していないと、次の量産の段階でも明確な指示が出せないので。今回使用するTTP223タッチセンサーは、100個セットで届いているので1つずつに分解して、ピンヘッダーをハンダする必要がある。ひたすらハンダしていく。

2024.06.02 2024.06.08

EntrepreneurMia

[Electronic Circuit] Found defective products after 100 boards were installed and filed a Quality Complaint with JLCPCB.

The order was placed with JLCPCB for 100 boards, but in reality some of the pin headers were slightly out of level, resulting in LCD displays interfering with each other and not fitting together The JLCPCB order history section has a 'Quality Complaint' field where you can enter the nature of the fault and the number of faulty boards. and the number of defective boards.

2024.05.24 2024.06.08

Development/Designelectronic circuit