Here’s a new promo for the Fusion PCB service by SeeedStudio: from today untill September 21st, you can order 3 PCBs for 1$ (excluding shipping costs) To take advantage of the offer, simply enter the order from the dedicated page of their website. The offer includes PCBs with the following characteristics: [checklist] 1/2 layers max size of 10x10cm…
Some months ago, Espressif announced the production of a new chip, named ESP32-PICO-D4. It’s a complete SiP (System in Package), that is a chip which integrates the esp32 microcontroller, a 4Mbit flash memory, a crystal oscillator, filter capacitors and RF matching links. The chip datasheet is available on the official website. Using this chip, it’s possible to create very small modules. I…
PlatformIO is an opensource ecosystem (as it’s defined in the homepage of the project) to develop IoT projects. The heart of the platform is a software component named PlatformIO Core. This component includes: [checklist] a cross-platform compiler a libraries and dependences manager a serial monitor [/checklist] PlatformIO Core is developed in Python and therefore it can run on…
I recently brought from Banggood a support for having a third hand during soldering operations… the support is made by an aluminum base and three arms which end with a crocodile clamp with insulating sheath: The assembly is very simple, the arms must be screwed on the base: In general this support is very useful; the arms are very well…
Not everyone knows that IIS (Internet Information Services), the webserver included in Windows Server, offers the possibility to perform mutual authentication using SSL certificates. You probably saw that, within the site’s SSL configuration, you can require an SSL client certificate to the client that is connecting: in this case, IIS only verifies that the submitted certificate…
After having published my previous posts about the JQ6500 module, some readers wrote me about an error the MusicDownload.exe application shows when they click on the upload button to store the mp3 files in the flash memory. The error is flashdata error, have not define program mode in flashdata.ini!! It seems that the application is…
In a previous post I presented the JQ6500 audio module. When you connect it to your computer, it’s detected as a CDROM drive. I brought some modules from different webstores. A couple of them gave me the following error when I tried to browse the content of the CD: Unable to access the disk. The disk…
For some time, on different chinese webstores (for example Banggood) there is a module called JQ6500 for sale: it’s often described as a voice sound module or as an MP3 player sound module. Actually JQ6500 is the name of the main chip hosted on the module: The chip is manufactured by a Chinese company named JQ. A datasheet for the chip is also…
In the previous posts I explained how to receive and send advertising packets based on the Bluetooth LE standard. The payload (that is the amount of “useful” data) of those packets is at most 31 bytes. It isn’t much: if – for example – you want to include the device name, little place remains for…
In the previous post, you learned how to send BLE advertising packets with the esp32 chip. To define the content of the packet, you used a struct, of the esp_ble_adv_data_t type: The struct’s definition is included in the esp_gap_ble_api.h file: Although there are many fields available, sometimes it is necessary to be able to define the content…