project maybe you can learn what didn't go right for these projects. Here is a list of hardware projects that didn't get funded. This list was pulled from the two top crowdfunding sites Indiegogo and Kickstarter. This isn't all of the projects that I had found but some of the more interesting ones.
| Board | Relays | Extra Inputs |
Extra Outputs |
Stack-able | Size | Pi Ver. | Price (usd) |
+1 |
|---|---|---|---|---|---|---|---|---|
PiFace  |
2 | 8 | 8 | YES(8) | A/B | A/B | $35 | |
PiFace Rev 2 |
2 | 8 | 8 | - | B+ | B+/2 | $44 | |
PiFace Relay+ |
4 | - | - | YES(8) | A+ | A+/B+/2 | $46 | |
SeeedStudio Hat |
4 | - | - | YES(?) | * | * | $32 | |
Plate Shield |
4 | - | - | - | B | A/B | $35 | |
LN Digital Interface |
2 | 8 | 8 | - | A+ | A+/B+/2 | $35 | |
| MiniPiio | 2 | - | - | - | 1/2 | A/B | $18 | |
| OpenElectronics I/O Exp Board |
8 | 8 | - | YES(8) | Large | A/B | $30 | |
| BCRobotics Relay Hat | 4 | - | - | - | A+ | A+/B+/2 | $19 | |
| Temperature Controller Plate | 2 | TypeK Therm. |
4 | YES | B | A/B | $50 | |
| 2803 4 Relay | 4 | - | 2 Stepper Motor |
YES | B | A/B | $34 | |
| 2803 2 Relay | 2 | - | 2 Stepper Motor |
YES | 1/2 | A/B | $25 | |
| Ps-6 Relay Hat | 6 | - | - | - | A+ | A+/B+/2 | $50 | |
| Slice of Relay | 2 | - | - | - | 1/2 | A/B | $17 | |
| Rpi+ 2Relay Hat | 2 | 1-Wire | - | - | A+ | A+/B+/2 | $23 | |
| OssoPi I/O Board | 8 | 8 | - | - | X-Large | A+/B+/2 | $103 | |
| ER-OPTO Relay4 Hat | 4 | - | - | YES | A+ | A+/B+/2 | $22 |
var websocket = new Websocket("wss://rpi?user=Eben&password=Upton");
static NSString *cellIdent = @"cellIdent";
NSMutableArray *outputs; //global array of our outputs for the piface
NSMutableArray *inputs; //global array of our inputs
- (void)viewDidLoad {
[super viewDidLoad];
_webSocket = [[SRWebSocket alloc] initWithURL:[NSURL URLWithString:@"wss://192.168.5.21:9000" ]];
_webSocket.delegate = self;
outputs = [@[@0,@0,@0,@0,@0,@0,@0,@0] mutableCopy];//pre populate our array with zeros
inputs = [@[@0,@0,@0,@0,@0,@0,@0,@0] mutableCopy];// "
self.tableView.dataSource = self; //don't forget to set your delegate for your datasource
//we have a custom xib for our tableview cell. register it here
[self.tableView registerNib:[UINib nibWithNibName:@"OutputTableViewCell" bundle:nil] forCellReuseIdentifier:cellIdent];
[self.webSocket open]; //open our websocket
}
-(void)webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean{
[self performSelector:@selector(connectWS) withObject:nil afterDelay:5];
}
-(void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error{
[self performSelector:@selector(connectWS) withObject:nil afterDelay:5];
}
-(void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message{
NSData *data = [message dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:nil];
[self parseJSON:json];
}
-(void)webSocket:(SRWebSocket *)webSocket didReceivePong:(NSData *)pongPayload{
}
-(void)webSocketDidOpen:(SRWebSocket *)webSocket{
}
-(void)parseJSON:(NSDictionary*)jsonObj{
if([jsonObj isKindOfClass:[NSArray class]]){
for (NSDictionary *dict in jsonObj) {
if([dict objectForKey:@"Outputs"]) [self parseOutputs:[dict objectForKey:@"Outputs"]];
if([dict objectForKey:@"Inputs"]) [self parseInputs:[dict objectForKey:@"Inputs"]];
}
}
else{
if([jsonObj objectForKey:@"Outputs"]) [self parseOutputs:[jsonObj objectForKey:@"Outputs"]];
if([jsonObj objectForKey:@"Inputs"]) [self parseInputs:[jsonObj objectForKey:@"Inputs"]];
}
}
-(void)parseOutputs:(NSString*)outputStr{
for(int index=0; index < outputStr.length; index++){
NSString *val = [outputStr substringWithRange:NSMakeRange(index, 1)];
[outputs setObject:@([val boolValue]) atIndexedSubscript:index];
}
[self.tableView reloadData];
}
-(void)parseInputs:(NSString*)inputStr{
for(int index=0; index < inputStr.length; index++){
NSString *val = [inputStr substringWithRange:NSMakeRange(index, 1)];
[inputs setObject:@([val boolValue]) atIndexedSubscript:index];
}
[self.tableView reloadData];
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
OutputTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdent forIndexPath:indexPath];
if(indexPath.section==0){
int output_num = [@(indexPath.item) intValue];
[cell setLabelText:[NSString stringWithFormat:@"Output: %d",output_num]];
[cell setOutputStatus:[outputs[indexPath.item] boolValue]];
[cell setOutput:output_num];
[cell setCmd:^(int output) {
[self.webSocket send:[NSString stringWithFormat:@"{\"Output\":\"%d\"}",output]];
}];
}
else{
int input_num = [@(indexPath.item) intValue];
[cell setLabelText:[NSString stringWithFormat:@"Input: %d",input_num]];
[cell setOutputStatus:[inputs[indexPath.item] boolValue]];
[cell setCmd:nil];
}
return cell;
}
-(void)connectWS{
_webSocket = [[SRWebSocket alloc] initWithURL:[NSURL URLWithString:@"wss://10.10.55.21:9000" ]];
_webSocket.delegate = self;
[self.webSocket open];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if(section==0)
return outputs.count;
if(section ==1)
return inputs.count;
else
return 0;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 2;
}
import threading
import os
import pifacedigitalio
from sys import exit
from time import sleep
import time
class Buttons(threading.Thread):
cmd = None
loop = True
button1Callback = None
button2Callback = None #set up a callback for each button
button2LongPressCallback = None #set up custom stuff if needed
def __init__(self):
threading.Thread.__init__(self)
self.cmd = pifacedigitalio.PiFaceDigital()
self.loop = True
def run(self):
time_pushed = 0
pushed_1 = False
pushed_2 = False
inputs = None
# toggle button turn relay 1 on
while self.loop:
sleep(0.05)
inputs = self.input_status()
outputs = self.output_status()
# print inputs, ' ', outputs
if inputs[0] == '1' and pushed_1 is not True:
pushed_1 = True
if self.button1Callback: # json callback for button press
self.button1Callback('{"Inputs":"' + self.input_status() + '"}')
if inputs[0] == '0' and pushed_1:
pushed_1 = False
self.cmd.relays[0].toggle()
if self.button1Callback: # json callback for button press
self.button1Callback('{"Outputs":"' + self.output_status() + '"}')
self.button1Callback('{"Inputs":"' + self.input_status() + '"}')
if inputs[1] == '1' and pushed_2 is not True:
pushed_2 = True
time_pushed = time.time()
if self.button2Callback:
self.button2Callback('{"Inputs":"' + self.input_status() + '"}')
if inputs[1] == '0' and pushed_2:
time_taken = time.time() - time_pushed
pushed_2 = False
if(self.button2Callback):
self.button2Callback('{"Inputs":"' + self.input_status() + '"}')
if time_taken < .5:
self.cmd.relays[1].toggle()
if self.button2Callback:
self.button2Callback('{"Outputs":"' + self.output_status() + '"}')
time_pushed = 0
if (time_taken > .5):
try:
if self.button2LongPressCallback:
self.button2LongPressCallback()
except:
pass
time_pushed = 0
def stop(self):
self.loop = False
def output_status(self):
list1 = self.cmd.output_port.value
status = '{0:08b}'.format(list1)[::-1]
return status
def output_cmd(self, pin, value, local=True):
self.cmd.leds[pin].value=value
if self.button2Callback and not local:
self.button2Callback('{"Outputs":"' + self.output_status() + '"}')
return self.output_status()
def input_status(self):
list1 = self.cmd.input_port.value
status = '{0:08b}'.format(list1)[::-1]
return status
class BroadcastServerFactory(WebSocketServerFactory):
def __init__(self, url, debug=False, debugCodePaths=False):
WebSocketServerFactory.__init__(self, url, debug=debug, debugCodePaths=debugCodePaths)
self.clients = []
self.lighting = Buttons()
self.lighting.button1Callback = self.broadcast
self.lighting.button2Callback = self.broadcast
self.lighting.start()
self.plugs = PlugPoller(plugIp, 8080)
self.plugs.statusChangeCallback = self.broadcast
self.lighting.button2LongPressCallback = self.plugs.toggleAll
Note what we did: def register(self, client):
if client not in self.clients:
client.sendMessage(json.dumps([{"Outputs":self.lighting.output_status()},
{"Inputs":self.lighting.input_status()},
{"Lamps":self.plugs.getstatus()}]))
print("registered client {}".format(client.peer))
self.clients.append(client)
def onMessage(self, payload, isBinary):
if not isBinary:
data = json.loads(payload)
if(data["Output"]):
output = data["Output"]
#get current status to toggle the output.
current = factory.lighting.output_status()[int(output)]
newval = not int(current)
#print(output,' ',current,' ',newval)
factory.lighting.output_cmd(int(output), newval, False)
Remember we put a status change callback whenever we call the output_cmd. That way all clients get the new status change.