diff --git a/backend/src/routes/pulse.routes.ts b/backend/src/routes/pulse.routes.ts
index 29b8470..9446da8 100644
--- a/backend/src/routes/pulse.routes.ts
+++ b/backend/src/routes/pulse.routes.ts
@@ -175,4 +175,157 @@ export async function pulseRoutes(fastify: FastifyInstance) {
             }
         }
     });
+
+    /**
+     * GET /pulse/thresholds
+     * Get current threshold configuration
+     */
+    fastify.get('/thresholds', {
+        handler: async (request, reply) => {
+            return {
+                thresholds: pulseThresholds,
+                lastUpdated: thresholdsLastUpdated?.toISOString() || null
+            };
+        }
+    });
+
+    /**
+     * POST /pulse/thresholds
+     * Set threshold alerts for Pulse sensors
+     */
+    fastify.post('/thresholds', {
+        handler: async (request, reply) => {
+            const config = request.body as {
+                temperature?: { min: number; max: number };
+                humidity?: { min: number; max: number };
+                vpd?: { min: number; max: number };
+                co2?: { min: number; max: number };
+            };
+
+            if (config.temperature) {
+                pulseThresholds.temperature = config.temperature;
+            }
+            if (config.humidity) {
+                pulseThresholds.humidity = config.humidity;
+            }
+            if (config.vpd) {
+                pulseThresholds.vpd = config.vpd;
+            }
+            if (config.co2) {
+                pulseThresholds.co2 = config.co2;
+            }
+
+            thresholdsLastUpdated = new Date();
+
+            fastify.log.info({ event: 'pulse_thresholds_updated', thresholds: pulseThresholds });
+
+            return {
+                success: true,
+                thresholds: pulseThresholds,
+                message: 'Thresholds updated successfully'
+            };
+        }
+    });
+
+    /**
+     * POST /pulse/check
+     * Check current readings against thresholds and broadcast alerts
+     */
+    fastify.post('/check', {
+        handler: async (request, reply) => {
+            const pulse = getPulseService();
+
+            if (!pulse) {
+                return reply.status(503).send({ error: 'Pulse not configured' });
+            }
+
+            try {
+                const readings = await pulse.getCurrentReadings();
+                const alerts: any[] = [];
+
+                for (const reading of readings) {
+                    // Temperature check
+                    if (reading.temperature !== undefined) {
+                        if (pulseThresholds.temperature.max && reading.temperature > pulseThresholds.temperature.max) {
+                            alerts.push(createAlert(reading, 'TEMPERATURE_HIGH', reading.temperature, pulseThresholds.temperature.max));
+                        }
+                        if (pulseThresholds.temperature.min && reading.temperature < pulseThresholds.temperature.min) {
+                            alerts.push(createAlert(reading, 'TEMPERATURE_LOW', reading.temperature, pulseThresholds.temperature.min));
+                        }
+                    }
+
+                    // Humidity check
+                    if (reading.humidity !== undefined) {
+                        if (pulseThresholds.humidity.max && reading.humidity > pulseThresholds.humidity.max) {
+                            alerts.push(createAlert(reading, 'HUMIDITY_HIGH', reading.humidity, pulseThresholds.humidity.max));
+                        }
+                        if (pulseThresholds.humidity.min && reading.humidity < pulseThresholds.humidity.min) {
+                            alerts.push(createAlert(reading, 'HUMIDITY_LOW', reading.humidity, pulseThresholds.humidity.min));
+                        }
+                    }
+
+                    // VPD check
+                    if (reading.vpd !== undefined) {
+                        if (pulseThresholds.vpd.max && reading.vpd > pulseThresholds.vpd.max) {
+                            alerts.push(createAlert(reading, 'VPD_HIGH', reading.vpd, pulseThresholds.vpd.max));
+                        }
+                        if (pulseThresholds.vpd.min && reading.vpd < pulseThresholds.vpd.min) {
+                            alerts.push(createAlert(reading, 'VPD_LOW', reading.vpd, pulseThresholds.vpd.min));
+                        }
+                    }
+
+                    // CO2 check
+                    if (reading.co2 !== undefined) {
+                        if (pulseThresholds.co2.max && reading.co2 > pulseThresholds.co2.max) {
+                            alerts.push(createAlert(reading, 'CO2_HIGH', reading.co2, pulseThresholds.co2.max));
+                        }
+                        if (pulseThresholds.co2.min && reading.co2 < pulseThresholds.co2.min) {
+                            alerts.push(createAlert(reading, 'CO2_LOW', reading.co2, pulseThresholds.co2.min));
+                        }
+                    }
+                }
+
+                // Broadcast alerts via WebSocket
+                for (const alert of alerts) {
+                    broadcastAlert(alert);
+                }
+
+                return {
+                    devicesChecked: readings.length,
+                    alertsTriggered: alerts.length,
+                    alerts,
+                    timestamp: new Date().toISOString()
+                };
+            } catch (error: any) {
+                fastify.log.error(error);
+                return reply.status(500).send({ error: error.message });
+            }
+        }
+    });
 }
+
+// In-memory threshold storage (would be persisted to DB in production)
+const pulseThresholds = {
+    temperature: { min: 65, max: 82 },  // °F
+    humidity: { min: 40, max: 70 },     // %
+    vpd: { min: 0.8, max: 1.2 },        // kPa
+    co2: { min: 400, max: 1500 }        // ppm
+};
+
+let thresholdsLastUpdated: Date | null = null;
+
+// Import broadcast function
+import { broadcastAlert } from '../plugins/websocket';
+
+function createAlert(reading: any, type: string, value: number, threshold: number) {
+    return {
+        id: `pulse-${Date.now()}-${Math.random().toString(36).slice(2)}`,
+        type,
+        sensorName: reading.deviceName || `Device ${reading.deviceId}`,
+        value,
+        threshold,
+        message: `${reading.deviceName || 'Pulse Sensor'}: ${type.replace('_', ' ')} (${value.toFixed(1)} vs threshold ${threshold})`,
+        timestamp: new Date().toISOString()
+    };
+}
+