Search found 137 matches

by Ollie
Mon Apr 24, 2017 4:21 am
Forum: STM32F4 Boards
Topic: tiny stm32 F4 boards
Replies: 36
Views: 598

Re: tiny stm32 F4 boards

The C.H.I.P is a viable alternative for RPi, but it cannot compete with Teensy or STM32F1/F4 in the peripheral operations. I still do prefer RPi due the more mature software support. My favorites are RPi 3 and RPi 0 with WiFi. I have been waiting for RPi 4. If it has Bluetooth 5 support it would be ...
by Ollie
Wed Apr 19, 2017 4:10 pm
Forum: STM32F4 Boards
Topic: tiny stm32 F4 boards
Replies: 36
Views: 598

Re: tiny stm32 F4 boards

Recently, I have been very pleased for the Teensy 3.2/3.5/3.6 boards. They are very compact, high quality, and have excellent S/W support. If the next Teensy 4.x would be F4 based, it would combine many good things. The lower cost of F4 compared to Kinetis chips could make Teensy 4.x even lower pric...
by Ollie
Mon Apr 17, 2017 11:19 pm
Forum: Off topic
Topic: New RPi Zero W - with Wifi and Bluetooth
Replies: 30
Views: 590

Re: New RPi Zero W - with Wifi and Bluetooth

RPi Zero W is now available in stores. I got mine from Adafruit. They still have a restriction of one RPi Zero W for $10 per customer. That is a good price, but the $9 delivery cost is "too" high.
by Ollie
Mon Apr 17, 2017 4:44 pm
Forum: General discussion
Topic: Bit Banding?
Replies: 6
Views: 227

Re: Bit Banding?

I did some measurements related Bit Banding usage for GPIO. Those can be found at https://github.com/OliviliK/STM32F103/wiki/Tutorial3_GPIO The main benefit of BB is the atomic change. This is essential for real-time operating system type of cases, where the mask based AND and OR operations can caus...
by Ollie
Sun Apr 09, 2017 4:32 pm
Forum: Off topic
Topic: Fuses and Circuit Breakers
Replies: 2
Views: 95

Re: Fuses and Circuit Breakers

The robot is using a 4S LiPo that has the nominal 14.8V potential, but in practice can be over 16V. If the current is over 30A then something is wrong. A typical continuous current is in range from 10 to 20A. I am planning some new robots for 5S or compact 12V Pb-acid batteries consuming over 50A. Y...
by Ollie
Sun Apr 09, 2017 12:04 am
Forum: Off topic
Topic: Fuses and Circuit Breakers
Replies: 2
Views: 95

Fuses and Circuit Breakers

I would like to hear your observations and recommendations to avoid hazard in cases where the system is powered by car battery or LiPo battery. The short circuits can cause serious damage if not protected. In past, I have been using fuses, but the little helpers can blow them too often. I am contemp...
by Ollie
Thu Mar 30, 2017 7:57 pm
Forum: Hardware
Topic: Level converter recommendation
Replies: 0
Views: 77

Level converter recommendation

My favorite motor controller (ST Vnh2SP30) works only with 5V logic. In past I have been using Arduino Mega board and there has been no need for converters. Now I am shifting my development to 3.3 V bards and need a converter. The two most popular converters in Aliexpress are 8 channel TXB0108 and 4...
by Ollie
Wed Mar 29, 2017 12:54 am
Forum: Off topic
Topic: Round Swiss Machine Pin
Replies: 0
Views: 92

Round Swiss Machine Pin

This could be old news for many forum readers, but for me this discovery was delightful. I was building some compact prototype boards and the normal female headers were giving me some headache. I didn't have the proper 7-pin header and had some troubles in shortening a long one. After some googling,...
by Ollie
Sun Mar 26, 2017 6:13 pm
Forum: General discussion
Topic: GPIO interrupts not re-entry safe?
Replies: 4
Views: 146

Re: GPIO interrupts not re-entry safe?

100 ms in ISR - that's strange :o
by Ollie
Sat Mar 25, 2017 7:20 pm
Forum: Off topic
Topic: ESP32
Replies: 5
Views: 380

Re: ESP32 - Widora Air

Sorry, I was too quick to recommend the new Widora Air board. Perhaps the next version after 5.0 is ready for prime time. Today I got my second Widora Air Ver 5.0. The blue LED was blinking when connecting the board to PC. The blinking stopped and the green and yellow LEDs were blinking when uploadi...

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