Attiny Over Serial Configuration A2

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Overview

RPICT board using Attiny microcontroller can be configured over serial using a utility written in python.

Current version allows changes of

  • Output format (csv Emonhub Emoncms)
  • Nodeid (device ID)
  • Polling (polling interval of data)
  • Ical (current calibration value)
  • Vcal (Voltage calibration value)
  • Phasecal (Phase calibration)
  • Vest (estimated voltage for power estimate)

Note this applies for boards RPICT3T1 RPICT4T4 RPICT3V1

It does not apply for boards RPICT3, RPICT7V1, RPICT8, RPICT4V3.

RPICT Configuration tool

The configuration tool can be downloaded directly from the raspberrypi:

$ wget lechacal.com/RPICT/tools/lcl-rpict-config.py.zip
$ unzip lcl-rpict-config.py.zip

Reading current configuration

Using the configurator without option only read the configuration stored in the board.

$ ./lcl-rpict-config.py

This yields

# RPICT Configuration Utility
# Read only
# Now reset RPICT hardware

Once the board has received the reset the configuration will be shown. How to reset the board

# 
# Configuration in memory:
# 
# Structure: 0xa2
# Format: 3
# NodeId: 11
# Polling: 2000
# KCAL:   83.3300018311  1.0  1.0  83.3300018311  1.0  1.0  1.0  83.3300018311
# PHASECAL: 0
# VEST: 240.000000
# xpFREQ: 50
# Ncycle: 20
# debug: 0
# 


The configuration is stored in the /tmp/rpict.config file when this is executed. We usually recommend to make a backup of this file.

Note. This above is for a RPICT3T1. If you have a different board the output might look different (in particular the order of numbers in the Kcal variable).

Modify the configuration

To change the values the configurator must be fed with a file containing the new values. We will use the example of a RPICT3T1. Such file looks as below.

[main]
format = 3
nodeid = 11
polling = 2000
kcal = 83.33 1. 1. 83.33 1. 1. 1. 83.33
phasecal = 0
vest = 240.00
xpFREQ = 50
Ncycle = 20
debug = 0


We save this file in my_rpict3t1.conf. Then we can now start the configurator with the -w option.

$ ./lcl-rpict-config.py -w my_rpict3t1.conf

Upon reset the configurator will display the old config then write the new config and display it.

# RPICT Configuration Utility
# Configuration will be overwritten (Ctrl C to cancel)
# Now reset RPICT hardware
# 
# Configuration in memory:
# 
# Structure: 0xa2
# Format: 3
# NodeId: 11
# Polling: 5000
# KCAL:   83.3300018311  1.0  1.0  83.3300018311  1.0  1.0  1.0  83.3300018311
# PHASECAL: 0
# VEST: 240.000000
# xpFREQ: 50
# Ncycle: 20
# debug: 0
# 
# Writing configuration with file A2/rpict3t1.conf
# 
# Configuration in memory:
# 
# Structure: 0xa2
# Format: 3
# NodeId: 11
# Polling: 2000
# KCAL:   83.3300018311  1.0  1.0  83.3300018311  1.0  1.0  1.0  83.3300018311
# PHASECAL: 0
# VEST: 240.000000
# xpFREQ: 50
# Ncycle: 20
# debug: 0
#

The configuration file

The configuration file fed into the utility must have the format below:

[main]
format = 3
nodeid = 11
polling = 2000
kcal = 83.33 1. 1. 83.33 1. 1. 1. 83.33
phasecal = 0
vest = 240.00
xpFREQ = 50
Ncycle = 20
debug = 0


format indicate which format output will be used. Must be an integer number.
0 - CSV
1 - deprecated
2 - deprecated
3 - Emonhub (recommended)

nodeid Will set the node id. An identifier that will be prepended to the beginning of the data.

polling Number of milliseconds between each data to be sent to the raspberrypi.

kcal Calibration coefficient. ical or vcal values.

  • rpctt3t1 ical1 ical2 ical3 are on position 1 4 8.
  • rpict3v1 ical1 ical2 ical3 V1 are on position 1 2 3 8.

vest Voltage to compute estimated power. (appiles to rpict3t1/rpict4t4). Usually 240V or 110V. Set vest=1 to obtain output as ampere instead of watts. Set vest=1000 to get milliampere.

xpFREQ Expected frequency of the waveform to measure. Typically 50Hz or 60Hz depending where you are. This must be a whole integer.

Ncycle Number of cycle used to compute the RMS signal. A good value is normally 20.

debug Turn debug on/off. Set it to 0 or 1. If on debug will make the output displaying more information about the reading. In particular which smallest polling can be achieved.

Restore Default Config

If things go wrong it is possible to reinstate default configuration as shown below.

Restoring the configuration will be necessary if you have just uploaded a new sketch.

RPICT3V1

$ wget lechacal.com/RPICT/config/A2/rpict3v1.conf
$ ./lcl-rpict-config.py -w rpict3v1.conf

RPICT3T1 & RPICT4T4

$ wget lechacal.com/RPICT/config/A2/rpict3t1.conf
$ ./lcl-rpict-config.py -w rpict3t1.conf

RPICT4V3 version 1

$ wget lechacal.com/RPICT/config/A2/rpict4v3.conf
$ ./lcl-rpict-config.py -w rpict4v3.conf

How to reset the board

Use a small jumper to link the reset pin with the ground. This can be found on the 3x2 6 pin ISP connector. Isp reset.png

Make contact with the two pins then remove the jumper. This will reset the board.