As you deploy RS485 (or CAN) on larger distances you will need to increase cable quality and lower baudrate. For 15 meter I don’t fuzz, I just twist a pair of cables and hook them up. A good advice is to have standard colours for A+ and B-. For better cable quality you can use…
This is a simple, passive switch anyone can wire on a vero-board. It just connect 8 ports in parrallell. “GBA+” is easy to remember and means Ground, B(-), A(+) and Power. You use one port as input and 7 as output in a classic star network. The only thing you need in addition are 120…
The Software on the Mini Sensor Module is outlined above. I need to wrap up a tight RS-X protocol as illustrated earlier. I also need a RTOS ported as well as sensor Logic for each sensor. DHL11 (or 22) uses a bit-bang protocol. We will use an interrupt on this pin with some timing for…
This is another 40 x 12mm module with RS485, 5-16V PSU, STM32F030F4, Light sensor, Humidity, temperature as well as a IR distance sensor. DHT11 can be replaced With DHT22 for a -50 to 125 degree range, but keep in mind that the rest of the electronics will not cover that range.
This is a All-In-One Small DC Motor controller using the tiny STM32F030 (or F042) MCU with a L9110. The PCB is 40×12 mm allowing the control system to be mounted as part of cabling to a motor.
This Hat takes advantage of the many pins on a LQPF64 to output a 32 channel servo Hat. 32 channels is a bit of an overkill for most, but the channels can be used for output, digital input and some for analogue input as well. A separate PSU connector for the servo’s must be provided.…
This is the first draft on a small DC motor Hat. It allows 4 motors to be connected at present. I actually want more motors, so I have to find a smaller connector. I have sufficient space for 8 motors, but the connectors limit me. The challenge is that these 5,08 pitch screw connectors are…
Not that much to write home about, but this is the latest 5 port communication Hat. Simplified CAN driver. Added double mounting holes for terminals to enable both vertical and horizontal terminals 3P 2.54 and 2P 5.08. Adjusted drilling hole sizes to M2.5, the same as RPI. Adjusted positions more accurate. Increased GPIO header holes…
The BLDC Motor Controller above is 40 mm x 12 mm and runs a 3-Phase motor with/without hall sensors up to 2A on 8-16V input. The communication interface is RS485. STM32F030F4 or STM32F042F6 MCU DRV10983 Motor Driver with HEXFET’s. F030/F042 in TSSOP20 package is among the smallest MCU’s from ST. I literally used every pin…
In addition to the silence time detection I can actually simplify the protocol by demanding that each device send a EOT (End Of Transmission) sequence. As EOT for 1 is detected by 2 it can start sending or just send it’s own EOT. If we design EOT to be a small message with status we…