Design Reference
Schematic and PCB design
emonTx schematic, board files and BOM are available on Solderpad
Portmap
Jack plug connections
TSL257 - optical sensor datasheet DS18B20 one-wire digital temperature sensor datasheet
Note: the resistor R8 should be omitted when using the TSL257 optical sensor to detect pulses from a pulse output meter.
Change log
- V1.0 - first release
- V1.1 - corrected CT circuit error
- V1.2 - complete re-route with GND plate added and signal wires increased to 10mill and power to 16mill. JeeNode offset header pins changed.
- V1.3 - complete re-route with http://www.freerouting.net/. Reduced vias from 36 to 5!
- V1.4 fixed R9 (one-wire temp) to be pull-up not pull-down
- V1.5 Changed one-wire temperature connection 2.5mm jack-port to enable the use of standard mono 2.5mm jack-plug
- V.2.0 Added another channel to make 3 CT channels. Added option for voltage measurement for real power measurement. Changed to 3.5mm CT jacks for comparability with seedstudio CT's
- V2.1 - slightly reduce PCB size to fit better into case (63.3x56mm), add voltage selectable jumper (5v3.3V) for pulse IRQ 3.5mm jack digital I/O, add footprint to solder in D18B20 temperature sensor directly onto the board, silkscreen changes including new rear graphics, added top ground plate.
- V2.2 - Added solder jumper to give option to connect temperature sensors to 5V instead of Vcc (3.3V) when emonTx is powered by 5V USB. Better for multiple sensors and medium/long cable runs
Changes for next version
- Multiple temperature sensor breakout terminals? Using horizontal insertion terminal blocks?
