diff --git a/hardware/PiSrf/LICENSE b/hardware/PiSrf/LICENSE
new file mode 100644
index 00000000..f433b1a5
--- /dev/null
+++ b/hardware/PiSrf/LICENSE
@@ -0,0 +1,177 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
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+
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diff --git a/hardware/PiSrf/README.md b/hardware/PiSrf/README.md
new file mode 100644
index 00000000..961faba8
--- /dev/null
+++ b/hardware/PiSrf/README.md
@@ -0,0 +1,31 @@
+node-red-node-pisrf
+===================
+
+A Node-RED node for Raspberry Pi
+to read range from an SRF05 Ultrasonic range sensor.
+
+**Only** works with a Raspberry Pi.
+
+Install
+-------
+
+Run the following command in the root directory of your Node-RED install.
+This is usually `~/.node-red`
+
+ npm install node-red-node-pisrf
+
+Usage
+-----
+
+Raspberry Pi input from an SRF04 or SRF05 ultrasonic range finder.
+
+The configuartion requires two GPIO pin numbers, the trigger pin and the echo pin.
+These can be any spare valid Pi GPIO pins. e.g.
+
+ 7,11
+
+Outputs a msg.payload with a number representing the range in cm.
+
+Produces one measure every 0.5s - but only if the distance is different from the previous reading.
+
+**Note:** we are using the actual physical pin numbers on connector P1 as they are easier to locate.
diff --git a/hardware/PiSrf/nrsrf b/hardware/PiSrf/nrsrf
new file mode 100755
index 00000000..346b9db4
--- /dev/null
+++ b/hardware/PiSrf/nrsrf
@@ -0,0 +1,16 @@
+#
+# Copyright 2015 IBM Corp.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+BASEDIR=$(dirname $0)
+sudo python -u $BASEDIR/nrsrf.py $@
diff --git a/hardware/PiSrf/nrsrf.py b/hardware/PiSrf/nrsrf.py
new file mode 100755
index 00000000..c80d4a1e
--- /dev/null
+++ b/hardware/PiSrf/nrsrf.py
@@ -0,0 +1,91 @@
+#!/usr/bin/python
+#
+# Copyright 2015 IBM Corp.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Python driver for SRF04 and SRO05 Ultrasonic sensors
+# Modified to use PINS not BCM : Dave Conway-Jones
+
+#import
+import RPi.GPIO as GPIO
+import time
+import sys
+import os, select
+
+# Turn off warnings if you run it a second time...
+GPIO.setwarnings(False)
+
+ECHO = 0
+TRIGGER = 0
+OLD = 0
+
+def Measure():
+ start = 0
+ realstart = 0
+ realstart = time.time()
+ GPIO.output(TRIGGER, True)
+ time.sleep(0.00001)
+ GPIO.output(TRIGGER, False)
+ start = time.time()
+ while GPIO.input(ECHO)==0:
+ start = time.time()
+ Dif = time.time() - realstart
+ if Dif > 0.2:
+ print("Ultrasonic Sensor Timed out, Restarting.")
+ time.sleep(0.4)
+ Main()
+ while GPIO.input(ECHO)==1:
+ stop = time.time()
+ elapsed = stop-start
+ distance = (elapsed * 36000)/2
+
+ return distance
+
+
+# Main program loop
+if len(sys.argv) > 1:
+ pins = sys.argv[1].lower().split(',')
+ if len(pins) != 2:
+ print "Bad number of pins supplied"
+ print pins
+ sys.exit(0)
+
+ TRIGGER = int(pins[0])
+ ECHO = int(pins[1])
+
+ GPIO.setmode(GPIO.BOARD) # Use GPIO BOARD numbers
+ GPIO.setup(TRIGGER, GPIO.OUT) # Trigger
+ GPIO.setup(ECHO, GPIO.OUT) # Echo
+ GPIO.output(ECHO, False)
+ GPIO.setup(ECHO,GPIO.IN)
+
+ # Flush stdin so we start clean
+ while len(select.select([sys.stdin.fileno()], [], [], 0.0)[0])>0:
+ os.read(sys.stdin.fileno(), 4096)
+
+ while True:
+ try:
+ distance = int( Measure() + 0.5 )
+ if distance != OLD:
+ print(distance)
+ OLD = distance
+ time.sleep(0.5)
+ except: # try to clean up on exit
+ print("0.0");
+ GPIO.cleanup(TRIGGER)
+ GPIO.cleanup(ECHO)
+ sys.exit(0)
+
+else:
+ print "Bad params"
+ print " sudo nrsrf.py trigger_pin,echo_pin"
+ sys.exit(0)
diff --git a/hardware/PiSrf/package.json b/hardware/PiSrf/package.json
new file mode 100644
index 00000000..1c28216f
--- /dev/null
+++ b/hardware/PiSrf/package.json
@@ -0,0 +1,23 @@
+{
+ "name" : "node-red-node-pisrf",
+ "version" : "0.0.1",
+ "description" : "A Node-RED node for a Raspberry Pi to use a SRF04 or SRF05 range finder",
+ "dependencies" : {
+ },
+ "repository" : {
+ "type":"git",
+ "url":"https://github.com/node-red/node-red-nodes/tree/master/hardware/PiSrf"
+ },
+ "license": "Apache-2.0",
+ "keywords": [ "node-red", "SRF04", "SRF05", "ultrasonic", "range" ],
+ "node-red" : {
+ "nodes" : {
+ "rpi-srf": "pisrf.js"
+ }
+ },
+ "author": {
+ "name": "Dave Conway-Jones",
+ "email": "ceejay@vnet.ibm.com",
+ "url": "http://nodered.org"
+ }
+}
diff --git a/hardware/PiSrf/pisrf.html b/hardware/PiSrf/pisrf.html
new file mode 100644
index 00000000..00ed8036
--- /dev/null
+++ b/hardware/PiSrf/pisrf.html
@@ -0,0 +1,56 @@
+
+
+
+
+
+
+
diff --git a/hardware/PiSrf/pisrf.js b/hardware/PiSrf/pisrf.js
new file mode 100644
index 00000000..2fc10574
--- /dev/null
+++ b/hardware/PiSrf/pisrf.js
@@ -0,0 +1,97 @@
+/**
+ * Copyright 2015 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+module.exports = function(RED) {
+ "use strict";
+ var util = require("util");
+ var spawn = require('child_process').spawn;
+ var fs = require('fs');
+
+ var gpioCommand = __dirname + '/nrsrf.py';
+
+ if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
+ //util.log("Info : Ignoring Raspberry Pi specific node.");
+ throw "Info : Ignoring Raspberry Pi specific node.";
+ }
+
+ if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
+ util.log("[rpi-srf] Info : Can't find Pi RPi.GPIO python library.");
+ throw "Warning : Can't find Pi RPi.GPIO python library.";
+ }
+
+ if (!(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]))) {
+ util.log("[rpi-srf] Error : " + gpioCommand + " needs to be executable.");
+ throw "Error : " + gpioCommand + " must to be executable.";
+ }
+
+ function PiSrfNode(n) {
+ RED.nodes.createNode(this, n);
+ this.pins = n.pins;
+ var node = this;
+
+ if (node.pins !== undefined) {
+ node.child = spawn(gpioCommand, [node.pins]);
+ node.running = true;
+ if (RED.settings.verbose) { node.log("pin: " + node.pins + " :"); }
+
+ node.child.stdout.on('data', function(data) {
+ if (RED.settings.verbose) { node.log("out: " + data + " :"); }
+ data = data.toString().trim();
+ if (data.length > 0) {
+ node.send({topic:"SRF",payload:data});
+ }
+ });
+
+ node.child.stderr.on('data', function(data) {
+ if (RED.settings.verbose) { node.log("err: " + data + " :"); }
+ });
+
+ node.child.on('close', function(code) {
+ if (RED.settings.verbose) { node.log("ret: " + code + " :"); }
+ node.child = null;
+ node.running = false;
+ });
+
+ node.child.on('error', function(err) {
+ if (err.errno === "ENOENT") { node.warn('Command not found'); }
+ else if (err.errno === "EACCES") { node.warn('Command not executable'); }
+ else { node.log('error: ' + err); }
+ });
+
+ }
+ else {
+ node.error("Invalid GPIO pins: " + node.pin);
+ }
+
+ var wfi = function(done) {
+ if (!node.running) {
+ if (RED.settings.verbose) { node.log("end"); }
+ done();
+ return;
+ }
+ setTimeout(function() { wfi(done); }, 333);
+ }
+
+ node.on("close", function(done) {
+ if (node.child != null) {
+ node.child.kill('SIGKILL');
+ }
+ wfi(done);
+ });
+
+ }
+ RED.nodes.registerType("rpi-srf", PiSrfNode);
+}