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This little breadboard is what I use to test the Pin (GPIO), Modulator (PWM), Controller (PID), and Serial features of the Diminuto C library.
This is the control board and plugs into the power board. It uses an Arduino to control the various functions.
An ESP-01 module provides an internet connection to allow an NTP server to be periodically used to update the local date and time.
The Arduino uses the date and time provided from the ESP-01 to determine when the cheap rate electricity period is active and if the battery voltage on DC_out is low enough to enable a 2kW, 48V PSU to top-up the batteries.
A zero cross detector feeds in a signal from the power board for controlling the phase timing of a triac. The triac and a parallel connected relay provide switching of the incoming mains to the PSU and to a small 12V SMPS on the power board.
Switches on the control board provide the ability to adjust the time of the start and end of the cheap rate period, emergency and standard charging voltage levels and the stop charging voltage level all through an in-built menu system.
The OLED display has dimming control and displays date, time, battery voltage and timing sync status.
A change from the 166-154-B control board was to allow a single programming port for both Arduino and ESP-01. A jumper is placed on the 2 pin connector when ESP-01 programming is required. This connects power from the programming port through to enable the ESP-01 and hold the Arduino is reset. In reset all Arduino pins are high impedance preventing the Arduino from interfering with ESP-01 programming.
Conversely, if the 2-pin jumper is not fitted when the Arduino is put into programming mode, its GPIOs are put into high impedance, removing the IC_EN signal to the ESP-01. In the absence of any other enabling signal the ESP-01 will power down preventing it interfering whilst the Arduino is being programmed.
OT - wired -
The piggyback version to the RPi Pico2 board has obvious advantages. For version with 2c87 and MC68882 all GPIO ports of the RPi Pico2 were required.
'Own' Background to the connection realization:
Preliminary data sheet for the predecessor 8087 from June 1980 and product preview for the MC68881 from 1984. (NP-358-R1)
Setting up my pile of plastic. Oh man it took awhile to figure out that POKE56577,x is the address to access GPIO pins on C64 User port. Obviously this is general knowledge but remember to POKE 56579 to 255 first, ok?
This is version #1 of my test fixture that I use to exercise some of the more hardware-centric (e.g. GPIO) functional tests of the Diminuto library.
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The VoCore2 is open source hardware. It has Wi-Fi, USB, UART, and 20+ GPIOs, but it’s o...
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Available Price - $ 37.35
Categories RF/IF and RFID > RF Transceiver ICs
Series -
Packaging Tray
Part Status Not For New Designs
Type TxRx + MCU
RF Family/Standard 802.15.4
Protocol -
Modulation DSSS, O-QPSK
Frequency 2.4GHz
Data Rate (Max) 250kbps
Power - Output 3dBm
Sensitivity -92dBm
Memory Size 16kB Flash, 1kB RAM
Serial Interfaces I²C, SPI
GPIO 32
Voltage - Supply 2 V ~ 3.4 V
Current - Receiving 37mA
Current - Transmitting 30mA
Operating Temperature -40°C ~ 85°C
Package / Case 71-VFLGA Exposed Pad
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