1 files changed, 56 insertions, 0 deletions

diff --git a/read.rb b/read.rb
new file mode 100755
index 0000000..5f8182e
--- /dev/null
+++ b/read.rb
@@ -0,0 +1,56 @@
+#!/usr/bin/ruby -w
+
+require "enumerable/statistics"
+require "serialport"
+
+SENSOR_BITS = 12
+SENSOR_MAX = (1 << SENSOR_BITS) - 1
+
+$stdout.sync = true
+def log(msg)
+  $stdout.write("#{Time.now.strftime("%H:%M:%S")} #{msg}\n")
+  $stdout.flush
+end
+
+sensors = []
+
+SerialPort.open("/dev/ttyACM1", 115200, 8, 1, SerialPort::NONE) do | port |
+
+  log("Allowing sensors to settle...")
+
+  sleep(3)
+  begin
+    port.read_nonblock(16 << 20)
+  rescue IO::WaitReadable
+  end
+  port.readline
+
+  log("Reading soil moisture sensors...")
+
+  10.times do
+    raw = port.readline
+    raise "Cannot parse sensor results #{raw.inspect}" unless raw =~ /\[([^\]]+)\]/
+
+    sensors << $1.split(/\s+/).filter { | x | not x.empty? }.map { | x | x.to_i }
+
+    log("Raw sensor results: \t#{sensors[-1].join("\t")}")
+  end
+
+end
+
+avgsensors = []
+stdsensors = []
+
+sensors.transpose.each do | sensor |
+  avgsensors << sensor.mean.round
+  stdsensors << sensor.stdev.round
+end
+
+log("Avg sensor results: \t#{avgsensors.join("\t")} \t(per sensor)")
+log("SDv sensor results: \t#{stdsensors.join("\t")} \t(per sensor)")
+
+avg = sensors.flatten.mean.round
+std = sensors.flatten.stdev.round
+
+log("Avg sensor results: \t#{avg} \t(#{(100.0 * avg.to_f / SENSOR_MAX.to_f).round}%) \t(overall)")
+log("SDv sensor results: \t#{std} \t(overall)")